MediaWiki core has provided a LESS mixin to show a bullet image fallback, mostly for IE 6-8 to workaround custom `list-style-image` set to an SVG. Falling back in those browsers to a Gif or PNG depending on which skin.
Let's remove the fallbacks, browsers which don't understand SVGs degrade gracefully to normal list bullets and as the images are data-uris we gonna save some bytes for all users.
Don't want to remove custom SVGs here, as default bullet on `sans-serif` can be much smaller. For IE6-8 that seems acceptable, but for modern browsers let's keep the SVG (for now).
[] Remove fallbacks and mixin usage in
[] MonoBook
[] Vector
[] MetroLook
[] Splash
Proposed treatment in IE 8/Vector without mixin:
{F28594165}
Also remove the mixin. I don't think we need a [[ https://codesearch.wmflabs.org/search/?q=.list-style-image-svg&i=nope&files=&repos= | deprecation time here ]], as long as we update all skins accordingly. But please share if you think otherwise.
[] Remove mixin