* Remove `id` and `aria-labelledby` from all SVGs
* Update SVGLint configuration
* Remove `aria-labelledby` from documentation
* Remove `aria-labelledby` from website
because why not
* Update Mastodon
Taken straight from their official source
Variant chosen is the one from their favicon
Closes#750
* Update Mastodon color
Source from their official SVG (thanks @ericcornelissen)