replace robot with the original, detailed one

I reduced the size by deleting a handful of very large paths
inside the eyes and LEDs. They barely change the output when
viewd side-by-side and possibly unnoticable otherwise.

The original robot SVG was 1MB as-is. 500KB after compression.
After deleting the paths, it went down to 34KB.

The full logo is about the same size now as the JPG.