Change icons to vector

[jtojnar]

This will make selfoss look crisper on hi-res displays and also allow better user.css theming.

[jtojnar]

Aargh! With the icons, the generated bundle is huge (2 MB).

I tried subsetting the icons like

import { fas } from '@fortawesome/free-solid-svg-icons';
library.add(fas.faCog);

and then

import { faCog } from '@fortawesome/free-solid-svg-icons';
library.add(faCog);

but neither of these really made the bundle smaller.

Finally I switched to deep imports

import { faCog } from '@fortawesome/free-solid-svg-icons/faCog';
library.add(faCog);

getting the size back down to 0.4 MB.

It turns out Parcel still does not use tree shaking by default, you have to enable it with --experimental-scope-hoisting flag. And enabling it breaks jQuery mousewheel since it is a bowl of spaghetti like all jQuery-related things.

Well never mind, I have been meaning to get rid of the custom scrollbar for a long time. But, apparently, it also does not support source maps. Welp.