Update logo.png (and logo.svg)

- Make logo.png 1024x1024 as originally intended
- Apply lossless compression (now 10k instead of 17k)
- Normalize logo.svg's viewbox, which probably caused the incorrectly sized logo.png in the first place

Fixes #737

docs/logo.svg

@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" version="1" viewBox="-459 -463 1024 1024"><path d="M565 513c0 26-22 48-48 48h-928c-26 0-48-22-48-48v-928c0-26 22-48 48-48h928c26 0 48 22 48 48v928z" fill="#1E1E1E"/><path d="M408 34L290-130c-6-8-20-15-30-15H16c-10 0-23 7-29 15l-33 45L40 34c3 4 5 10 5 15s-2 11-5 15l-86 119 33 45c6 8 19 15 29 15h244c10 0 24-7 30-15L408 64c3-4 5-10 5-15s-2-11-5-15zM206-90c12 0 21 9 21 21s-9 21-21 21-21-9-21-21 9-21 21-21z" fill="#FFF"/><path d="M3 49c0 6-2 11-5 15l-119 164c-6 8-20 15-30 15h-146c-7 0-11-3-11-8 0-2 1-5 3-7l130-179-130-179-3-7c0-5 4-8 11-8h146c10 0 24 7 30 15L-2 34c3 4 5 10 5 15z" fill="#fff"/></svg>
+<svg width="1024" height="1024" xmlns="http://www.w3.org/2000/svg"><g fill="none"><path d="M1024 976c0 26-22 48-48 48H48c-26 0-48-22-48-48V48C0 22 22 0 48 0h928c26 0 48 22 48 48v928z" fill="#1E1E1E"/><path d="M867 497L749 333c-6-8-20-15-30-15H475c-10 0-23 7-29 15l-33 45 86 119c3 4 5 10 5 15s-2 11-5 15l-86 119 33 45c6 8 19 15 29 15h244c10 0 24-7 30-15l118-164c3-4 5-10 5-15s-2-11-5-15zM665 373c12 0 21 9 21 21s-9 21-21 21-21-9-21-21 9-21 21-21z" fill="#FFF"/><path d="M462 512c0 6-2 11-5 15L338 691c-6 8-20 15-30 15H162c-7 0-11-3-11-8 0-2 1-5 3-7l130-179-130-179-3-7c0-5 4-8 11-8h146c10 0 24 7 30 15l119 164c3 4 5 10 5 15z" fill="#FFF"/></g></svg>