Visually centered a few icons, some new paths and optimizations.

Apple - Visually centered and change the path to more a accurate one.
Bytes: 1011 —> 580.

Dropbox - Visually centered and change the path to fix point alignment.
Bytes: 338 —> 350.

Twitter - Visually centered.
Bytes: 425 —> 431.

Ubuntu - Visually centered and change the path and color to a more
accurate one.
Bytes: 755 —> 674.

Vimeo - Visually centered.
Bytes: 375 —> 379.

WhatsApp - Visually centered and change the path and color to more a
accurate one.
Bytes: 646 —> 611.

Windows - Visually centered and change the path to fix the lines
between shapes.
Bytes: 274 —> 284.

Hope this helps.

FYI: Wikicommons have good SVG shapes and most companies have brand
guidelines with accurate logo renditions and colors.

images/svg/vimeo.svg

@@ -1 +1,4 @@
-<svg xmlns="http://www.w3.org/2000/svg" aria-label="Vimeo" role="img" viewBox="0 0 512 512"><rect width="512" height="512" fill="#1eb8eb" rx="15%"/><path fill="#fff" d="M454 165c-22 126-147 233-185 257-37 24-72-10-84-35-14-30-57-189-68-202-11-14-45 13-45 13l-16-22s68-81 120-91c55-11 55 84 68 137 13 51 21 80 32 80s33-28 56-72c24-43-1-82-47-55 19-109 191-136 169-10z"/></svg>
+<svg role="img" aria-label="Vimeo" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg">
+<rect fill="#1eb8eb" height="512" rx="15%" width="512"/>
+<path d="M444 173c-22 126-147 233-185 257-37 24-72-10-84-35-14-30-57-189-68-202-11-14-45 13-45 13l-16-22s68-81 120-91c55-11 55 84 68 137 13 51 21 80 32 80s33-28 56-72c24-43-1-82-47-55 19-109 191-136 169-10z" fill="#fff"/>
+</svg>