optimized logo (#2020)

- adjusted elements to fit the pixel grid for better scaling
- optimized the PNG asset and the SVG asset

app/assets/images/logo.svg

@@ -1 +1 @@
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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000" height="1000" width="1000"><path d="M500 0a500 500 0 0 0-353.553 146.447 500 500 0 1 0 707.106 707.106A500 500 0 0 0 500 0zm-.059 280.05h107.12c-19.071 13.424-26.187 51.016-27.12 73.843V562.05c0 44.32-35.68 80-80 80s-80-35.68-80-80v-202c0-44.32 35.68-80 80-80zm-.441 52c-15.464 0-28 12.537-28 28 0 15.465 12.536 28 28 28s28-12.535 28-28c0-15.463-12.536-28-28-28zm-279.059 7.9c44.32 0 80 35.68 80 80v206.157c.933 22.827 8.049 60.42 27.12 73.842H220.44c-44.32 0-80-35.68-80-80v-200c0-44.32 35.68-80 80-80zm559.12 0c44.32 0 80 35.68 80 80v200c0 44.32-35.68 80-80 80H672.44c19.071-13.424 26.187-51.016 27.12-73.843V419.95c0-44.32 35.68-80 80-80zM220 392c-15.464 0-28 12.536-28 28s12.536 28 28 28 28-12.536 28-28-12.536-28-28-28zm560 0c-15.464 0-28 12.536-28 28s12.536 28 28 28 28-12.536 28-28-12.536-28-28-28zm-280.5 40.05c-15.464 0-28 12.537-28 28 0 15.465 12.536 28 28 28s28-12.535 28-28c0-15.463-12.536-28-28-28zM220 491.95c-15.464 0-28 12.535-28 28 0 15.463 12.536 28 28 28s28-12.537 28-28c0-15.465-12.536-28-28-28zm560 0c-15.464 0-28 12.535-28 28 0 15.463 12.536 28 28 28s28-12.537 28-28c0-15.465-12.536-28-28-28zM499.5 532c-15.464 0-28 12.536-28 28s12.536 28 28 28 28-12.536 28-28-12.536-28-28-28zM220 591.95c-15.464 0-28 12.535-28 28 0 15.463 12.536 28 28 28s28-12.537 28-28c0-15.465-12.536-28-28-28zm560 0c-15.464 0-28 12.535-28 28 0 15.463 12.536 28 28 28s28-12.537 28-28c0-15.465-12.536-28-28-28z" fill="#189efc"/></svg>