Use zopflipng to re-copmress png images losslessly

[PeterDaveHello]

169 png images are optimized as below:

 logos/eye/option1/black/eyelogo-black-500x500.png                            | Bin 7171 -> 3453 bytes
 logos/eye/option1/black/eyelogo-black-60x60.png                              | Bin 819 -> 593 bytes
 logos/eye/option1/black/eyelogo-shield-black-500x500.png                     | Bin 7072 -> 3089 bytes
 logos/eye/option1/black/eyelogo-shield-black-60x60.png                       | Bin 807 -> 563 bytes
 logos/eye/option1/eyelogo-color-500x500.png                                  | Bin 9919 -> 4246 bytes
 logos/eye/option1/eyelogo-color-60x60.png                                    | Bin 1294 -> 844 bytes
 logos/eye/option1/eyelogo-color-dark-500x500.png                             | Bin 10230 -> 4133 bytes
 logos/eye/option1/eyelogo-color-dark-60x60.png                               | Bin 1315 -> 772 bytes
 logos/eye/option1/eyelogo-shield-color-500x500.png                           | Bin 10124 -> 4045 bytes
 logos/eye/option1/eyelogo-shield-color-60x60.png                             | Bin 1350 -> 760 bytes
 logos/eye/option1/eyelogo-shield-color-dark-500x500.png                      | Bin 10114 -> 4016 bytes
 logos/eye/option1/eyelogo-shield-color-dark-60x60.png                        | Bin 1281 -> 733 bytes
 logos/eye/option1/white/eyelogo-shield-white-500x500.png                     | Bin 6720 -> 2938 bytes
 logos/eye/option1/white/eyelogo-shield-white-60x60.png                       | Bin 784 -> 419 bytes
 logos/eye/option1/white/eyelogo-white-500x500.png                            | Bin 6330 -> 3043 bytes
 logos/eye/option1/white/eyelogo-white-60x60.png                              | Bin 746 -> 412 bytes
 logos/gadget_logo/IO_500_color.png                                           | Bin 6454 -> 2454 bytes
 logos/gadget_logo/IO_500_dark.png                                            | Bin 6308 -> 2454 bytes
 logos/gadget_logo/IO_500_light.png                                           | Bin 5371 -> 2454 bytes
 logos/gadget_logo/IO_60_color.png                                            | Bin 1036 -> 472 bytes
 logos/gadget_logo/IO_60_dark.png                                             | Bin 1044 -> 472 bytes
 logos/gadget_logo/IO_60_light.png                                            | Bin 868 -> 472 bytes
 logos/getify-hexoctjs/option1/iojs1-500x500-dark.png                         | Bin 24284 -> 15230 bytes
 logos/getify-hexoctjs/option1/iojs1-500x500-light.png                        | Bin 22509 -> 14802 bytes
 logos/getify-hexoctjs/option1/iojs1-500x500.png                              | Bin 21921 -> 14849 bytes
 logos/getify-hexoctjs/option1/iojs1-60x60-dark.png                           | Bin 2714 -> 1631 bytes
 logos/getify-hexoctjs/option1/iojs1-60x60-light.png                          | Bin 2490 -> 1596 bytes
 logos/getify-hexoctjs/option1/iojs1-60x60.png                                | Bin 2656 -> 1955 bytes
 logos/getify-hexoctjs/option2/iojs2-500x500-dark.png                         | Bin 24723 -> 15751 bytes
 logos/getify-hexoctjs/option2/iojs2-500x500-light.png                        | Bin 22953 -> 15309 bytes
 logos/getify-hexoctjs/option2/iojs2-500x500.png                              | Bin 22337 -> 15343 bytes
 logos/getify-hexoctjs/option2/iojs2-60x60-dark.png                           | Bin 2750 -> 1664 bytes
 logos/getify-hexoctjs/option2/iojs2-60x60-light.png                          | Bin 2511 -> 1626 bytes
 logos/getify-hexoctjs/option2/iojs2-60x60.png                                | Bin 2675 -> 1999 bytes
 logos/getify-hexoctjs/option3/iojs3-500x500-dark.png                         | Bin 28479 -> 18414 bytes
 logos/getify-hexoctjs/option3/iojs3-500x500-light.png                        | Bin 30326 -> 20497 bytes
 logos/getify-hexoctjs/option3/iojs3-500x500.png                              | Bin 28520 -> 20027 bytes
 logos/getify-hexoctjs/option3/iojs3-60x60-dark.png                           | Bin 3022 -> 1924 bytes
 logos/getify-hexoctjs/option3/iojs3-60x60-light.png                          | Bin 3154 -> 2079 bytes
 logos/getify-hexoctjs/option3/iojs3-60x60.png                                | Bin 3206 -> 2353 bytes
 logos/getify-hexoctjs/option4/iojs4-500x500-dark.png                         | Bin 28959 -> 18974 bytes
 logos/getify-hexoctjs/option4/iojs4-500x500-light.png                        | Bin 30746 -> 20930 bytes
 logos/getify-hexoctjs/option4/iojs4-500x500.png                              | Bin 28966 -> 20595 bytes
 logos/getify-hexoctjs/option4/iojs4-60x60-dark.png                           | Bin 3039 -> 1978 bytes
 logos/getify-hexoctjs/option4/iojs4-60x60-light.png                          | Bin 3169 -> 2095 bytes
 logos/getify-hexoctjs/option4/iojs4-60x60.png                                | Bin 3247 -> 2415 bytes
 logos/heificon/heificon-500x500.png                                          | Bin 7288 -> 3173 bytes
 logos/heificon/heificon-60x60.png                                            | Bin 865 -> 477 bytes
 logos/heificon/heificon-color-variations.png                                 | Bin 19778 -> 8024 bytes
 logos/hex-3d/hex-3d-lg.png                                                   | Bin 39606 -> 19659 bytes
 logos/hex-3d/hex-3d-sm.png                                                   | Bin 21290 -> 4358 bytes
 logos/hex-io-node/hex-io-node_500x500.png                                    | Bin 18385 -> 12285 bytes
 logos/hex-io-node/hex-io-node_60x60.png                                      | Bin 2236 -> 1332 bytes
 logos/hex-io-node/hex-io-node_dark_500x500.png                               | Bin 19368 -> 13201 bytes
 logos/hex-io-node/hex-io-node_dark_60x60.png                                 | Bin 2091 -> 1243 bytes
 logos/hex-io-node/hex-io-node_white_500x500.png                              | Bin 20036 -> 13361 bytes
 logos/hex-io-node/hex-io-node_white_60x60.png                                | Bin 2136 -> 1253 bytes
 logos/hex-io/hex-io_500x500.png                                              | Bin 16327 -> 10948 bytes
 logos/hex-io/hex-io_60x60.png                                                | Bin 1990 -> 1239 bytes
 logos/hex-io/hex-io_dark_500x500.png                                         | Bin 17210 -> 6847 bytes
 logos/hex-io/hex-io_dark_60x60.png                                           | Bin 1878 -> 1166 bytes
 logos/hex-io/hex-io_white_500x500.png                                        | Bin 17648 -> 11916 bytes
 logos/hex-io/hex-io_white_60x60.png                                          | Bin 1895 -> 1168 bytes
 logos/io-eclipse/io-eclipse-preview.png                                      | Bin 42255 -> 30391 bytes
 logos/io-eclipse/io-eclipse-transparent-500x500.png                          | Bin 18741 -> 13624 bytes
 logos/io-eclipse/io-eclipse-transparent-60x60.png                            | Bin 2309 -> 1744 bytes
 logos/io-hex-simple/io-hex-simple-500px.png                                  | Bin 74715 -> 56989 bytes
 logos/io-hex-simple/io-hex-simple-60px.png                                   | Bin 6957 -> 4573 bytes
 logos/io-hex-simple/io-hex-simple-dark-500px.png                             | Bin 70897 -> 51299 bytes
 logos/io-hex-simple/io-hex-simple-dark-60px.png                              | Bin 6678 -> 4369 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-120x120-escher.png               | Bin 3106 -> 1950 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-120x120-image_background-1.png   | Bin 16001 -> 14788 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-120x120-image_background-2.png   | Bin 6833 -> 5841 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-16x16-closed.png                 | Bin 294 -> 149 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-16x16-open.png                   | Bin 334 -> 198 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-500x500.png                      | Bin 6996 -> 2273 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-500x500_depth.png                | Bin 11282 -> 5481 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-colour_blue.png            | Bin 797 -> 376 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-colour_blue_depth.png      | Bin 1515 -> 946 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-colour_green.png           | Bin 783 -> 376 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-colour_green_depth.png     | Bin 1369 -> 855 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-colour_red.png             | Bin 790 -> 376 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-colour_red_depth.png       | Bin 1387 -> 877 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-colour_yellow.png          | Bin 801 -> 376 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-colour_yellow_depth.png    | Bin 1557 -> 970 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-dark_background.png        | Bin 860 -> 350 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-dark_background_depth.png  | Bin 1542 -> 568 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-light_background.png       | Bin 868 -> 350 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60-light_background_depth.png | Bin 1552 -> 579 bytes
 logos/iojs-barryels/option-1/dist/iojs-logo-60x60.png                        | Bin 638 -> 376 bytes
 logos/iojs-cubed/logo-500x500-reversed.png                                   | Bin 4511 -> 4488 bytes
 logos/iojs-cubed/logo-500x500.png                                            | Bin 5288 -> 4806 bytes
 logos/iojs-cubed/logo-60x60.png                                              | Bin 635 -> 617 bytes
 logos/iojs-cubed/logo-variations.png                                         | Bin 42687 -> 39584 bytes
 logos/iojs-hee-haw/iojs-heehaw-examples.png                                  | Bin 47977 -> 18220 bytes
 logos/iojs-hee-haw/iojs-heehaw-small.png                                     | Bin 3517 -> 1656 bytes
 logos/iojs-hee-haw/iojs-heehaw.png                                           | Bin 28467 -> 10776 bytes
 logos/iojs-hex-logo/iojs-hex-logo-500.png                                    | Bin 59542 -> 1725 bytes
 logos/iojs-hex-logo/iojs-hex-logo-60.png                                     | Bin 51322 -> 1100 bytes
 logos/iojs-hex-logo/iojs-hex-logo-dark.png                                   | Bin 67393 -> 7930 bytes
 logos/iojs-jupiter-hex/500px-inverted.png                                    | Bin 20213 -> 14589 bytes
 logos/iojs-jupiter-hex/500px.png                                             | Bin 21304 -> 15198 bytes
 logos/iojs-jupiter-hex/60px.png                                              | Bin 2717 -> 1947 bytes
 logos/iojs-mini/dist/mini-dark_128x128.png                                   | Bin 3483 -> 2361 bytes
 logos/iojs-mini/dist/mini-dark_16x16.png                                     | Bin 541 -> 381 bytes
 logos/iojs-mini/dist/mini-dark_256x256.png                                   | Bin 7117 -> 4721 bytes
 logos/iojs-mini/dist/mini-dark_32x32.png                                     | Bin 983 -> 674 bytes
 logos/iojs-mini/dist/mini-dark_500x500.png                                   | Bin 14144 -> 10425 bytes
 logos/iojs-mini/dist/mini-dark_512x512.png                                   | Bin 14640 -> 10754 bytes
 logos/iojs-mini/dist/mini-dark_64x64.png                                     | Bin 1827 -> 1231 bytes
 logos/iojs-mini/dist/mini-light_128x128.png                                  | Bin 4086 -> 2824 bytes
 logos/iojs-mini/dist/mini-light_16x16.png                                    | Bin 642 -> 469 bytes
 logos/iojs-mini/dist/mini-light_256x256.png                                  | Bin 8163 -> 5912 bytes
 logos/iojs-mini/dist/mini-light_32x32.png                                    | Bin 1156 -> 846 bytes
 logos/iojs-mini/dist/mini-light_500x500.png                                  | Bin 16177 -> 13491 bytes
 logos/iojs-mini/dist/mini-light_512x512.png                                  | Bin 16799 -> 14022 bytes
 logos/iojs-mini/dist/mini-light_64x64.png                                    | Bin 2147 -> 1583 bytes
 logos/iojs-moon-closeup/iojs-moon-closeup.png                                | Bin 28797 -> 18337 bytes
 logos/iojs-moon-closeup/iojs-moon-closeup_bg_dark.png                        | Bin 36075 -> 20044 bytes
 logos/iojs-moon-closeup/iojs-moon-closeup_bg_light.png                       | Bin 36164 -> 20048 bytes
 logos/iojs-moon-closeup/iojs-moon-closeup_thumb.png                          | Bin 7295 -> 6811 bytes
 logos/iojs-multiple-hex/iojs-logo-dark_500x500.png                           | Bin 15871 -> 5138 bytes
 logos/iojs-multiple-hex/iojs-logo-dark_60x60.png                             | Bin 1740 -> 928 bytes
 logos/iojs-multiple-hex/iojs-logo_500x500.png                                | Bin 12341 -> 4638 bytes
 logos/iojs-multiple-hex/iojs-logo_60x60.png                                  | Bin 1622 -> 1013 bytes
 logos/minimal/black-500.png                                                  | Bin 19114 -> 8584 bytes
 logos/minimal/black-60.png                                                   | Bin 3780 -> 3444 bytes
 logos/minimal/in-situ.png                                                    | Bin 902107 -> 804690 bytes
 logos/minimal/yellow-500.png                                                 | Bin 23421 -> 13956 bytes
 logos/minimal/yellow-60.png                                                  | Bin 4365 -> 3581 bytes
 logos/octo-io/LogoBlackBack.png                                              | Bin 18736 -> 14185 bytes
 logos/octo-io/LogoBlackBackSmall.png                                         | Bin 20595 -> 4891 bytes
 logos/octo-io/LogoWhiteBack.png                                              | Bin 17847 -> 15293 bytes
 logos/octo-io/LogoWhiteBackSmall.png                                         | Bin 20533 -> 5039 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_green_500x500_dark.png           | Bin 15579 -> 11287 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_green_500x500_light.png          | Bin 14873 -> 6241 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_green_50x50_dark.png             | Bin 1984 -> 1526 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_green_50x50_light.png            | Bin 1939 -> 1457 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_orange_500x500_dark.png          | Bin 13353 -> 10187 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_orange_500x500_light.png         | Bin 12932 -> 10475 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_orange_50x50_dark.png            | Bin 1637 -> 1231 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_orange_50x50_light.png           | Bin 1584 -> 1210 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_raspberry_500x500_dark.png       | Bin 15160 -> 11239 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_raspberry_500x500_light.png      | Bin 15066 -> 6245 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_raspberry_50x50_dark.png         | Bin 1948 -> 1506 bytes
 logos/reuleauxtri_io/flipped/reuleauxtri_io_raspberry_50x50_light.png        | Bin 1922 -> 1469 bytes
 logos/reuleauxtri_io/reuleauxtri_io_green_500x500_dark.png                   | Bin 15608 -> 11215 bytes
 logos/reuleauxtri_io/reuleauxtri_io_green_500x500_light.png                  | Bin 15081 -> 6259 bytes
 logos/reuleauxtri_io/reuleauxtri_io_green_50x50_dark.png                     | Bin 1974 -> 1553 bytes
 logos/reuleauxtri_io/reuleauxtri_io_green_50x50_light.png                    | Bin 1951 -> 1491 bytes
 logos/reuleauxtri_io/reuleauxtri_io_orange_500x500_dark.png                  | Bin 13531 -> 10035 bytes
 logos/reuleauxtri_io/reuleauxtri_io_orange_500x500_light.png                 | Bin 13123 -> 10396 bytes
 logos/reuleauxtri_io/reuleauxtri_io_orange_50x50_dark.png                    | Bin 1649 -> 1267 bytes
 logos/reuleauxtri_io/reuleauxtri_io_orange_50x50_light.png                   | Bin 1614 -> 1240 bytes
 logos/reuleauxtri_io/reuleauxtri_io_raspberry_500x500_dark.png               | Bin 15267 -> 11134 bytes
 logos/reuleauxtri_io/reuleauxtri_io_raspberry_500x500_light.png              | Bin 15214 -> 6271 bytes
 logos/reuleauxtri_io/reuleauxtri_io_raspberry_50x50_dark.png                 | Bin 1951 -> 1542 bytes
 logos/reuleauxtri_io/reuleauxtri_io_raspberry_50x50_light.png                | Bin 1947 -> 1502 bytes
 logos/simple-iojs/Simple-IOJS_500px.png                                      | Bin 15493 -> 11915 bytes
 logos/simple-iojs/Simple-IOJS_60px.png                                       | Bin 2228 -> 1759 bytes
 logos/slick-iojs/logo-circle-500.png                                         | Bin 19580 -> 9832 bytes
 logos/slick-iojs/logo-circle-60.png                                          | Bin 1811 -> 1153 bytes
 logos/slick-iojs/logo-dark-bg.png                                            | Bin 12833 -> 4850 bytes
 logos/slick-iojs/logo-hexagon-500.png                                        | Bin 15835 -> 7942 bytes
 logos/slick-iojs/logo-hexagon-60.png                                         | Bin 1427 -> 730 bytes
 logos/yellow-hex/500px.png                                                   | Bin 13963 -> 10463 bytes
 logos/yellow-hex/60px.png                                                    | Bin 3334 -> 1829 bytes
 logos/yellow-hex/dark.png                                                    | Bin 16801 -> 12518 bytes
 logos/yellow-hex/light.png                                                   | Bin 15685 -> 12284 bytes