Enhance artists list by using our new artist card and remove masonry

I had to work on a simpler artist card widget for the tag feature:

When viewing /library/artists, we currently have this card (it's been here for two years I think):

I tend to think the first one is less cluttered and leaves more visual space to breath, which is why I suggest we replace the old one with this new design. By removing the listing of albums, it also removes the need for our masonry layout (which is quite buggy and slow at the moment), and allows us to display more artist cards in the same space (50% more in this example, but this is dependant of the number of albums associated with the displayed artists).

cc @funkwhale/reviewers-front

Before

After