[ImgBot] Optimize images

*Total -- 457.15kb -> 385.87kb (15.59%)

/docs/images/why_multicore.png -- 11.21kb -> 3.16kb (71.79%)
/docs/images/why_throughput.png -- 7.02kb -> 2.58kb (63.22%)
/docs/images/why_multithreading.png -- 9.07kb -> 5.16kb (43.12%)
/docs/images/why_coroutine.png -- 10.96kb -> 6.82kb (37.72%)
/docs/images/connection.png -- 33.84kb -> 22.11kb (34.66%)
/docs/images/engine.png -- 25.74kb -> 17.43kb (32.29%)
/docs/images/why_single_task.png -- 8.13kb -> 5.63kb (30.82%)
/docs/theme/static/images/icon-info.svg -- 1.86kb -> 1.36kb (26.96%)
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/docs/theme/static/images/icon-note.svg -- 1.65kb -> 1.25kb (23.86%)
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/docs/images/community.svg -- 3.24kb -> 2.58kb (20.31%)
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/docs/theme/static/images/reference-logo.svg -- 2.24kb -> 1.81kb (19.13%)
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/docs/theme/static/images/box-bg-dec.svg -- 1.81kb -> 1.51kb (16.76%)
/docs/theme/static/images/OK.png -- 20.98kb -> 18.19kb (13.32%)
/docs/images/github.svg -- 5.39kb -> 4.69kb (12.89%)
/docs/theme/static/images/icon-warning.svg -- 4.30kb -> 3.75kb (12.75%)
/docs/images/explanation.svg -- 3.13kb -> 2.73kb (12.72%)
/docs/theme/static/images/icon-hint.svg -- 4.46kb -> 3.96kb (11.09%)
/docs/theme/static/images/aha.png -- 30.51kb -> 27.28kb (10.59%)
/docs/images/open-source.svg -- 3.34kb -> 3.00kb (10.2%)
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/docs/images/tutorials.svg -- 6.80kb -> 6.22kb (8.54%)
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/docs/images/gino-fastapi-config.svg -- 6.22kb -> 5.79kb (7%)
/docs/images/gino-fastapi-models.svg -- 6.34kb -> 5.91kb (6.91%)
/docs/images/gino-fastapi-views.svg -- 7.71kb -> 7.22kb (6.34%)
/docs/images/gino-fastapi-models-users.svg -- 7.74kb -> 7.25kb (6.33%)
/docs/images/gino-fastapi.svg -- 20.45kb -> 19.18kb (6.23%)
/docs/images/gino-fastapi-alembic.svg -- 8.85kb -> 8.32kb (6.01%)
/docs/images/gino-fastapi-src.svg -- 8.87kb -> 8.34kb (6%)
/docs/theme/static/logo.svg -- 17.11kb -> 16.09kb (5.94%)
/docs/images/reference.svg -- 6.46kb -> 6.11kb (5.31%)
/docs/images/gino-fastapi-layout.svg -- 37.46kb -> 35.86kb (4.27%)
/docs/images/263px-Minimum-Tonne.svg.png -- 29.52kb -> 28.50kb (3.46%)
/docs/theme/static/images/fighting.png -- 27.35kb -> 27.00kb (1.25%)

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