Simplify Mastodon

Simplify Mastodon

First stab at simplifying Mastodon:

** Centers content (puts posts into cards with space between them, dims actions until hover, hides title bar on scroll, puts left and right columns at edge of window)

** Puts compose and search on right, minimized to an icon unless in use

** Puts nav on left and minimizes to icons unless you hover

** Hides trends and nav items I don't think are useful (Local, Federated, Favorites, Bookmarks, and Lists) -- might add a way to expand or customize this in future

** Works on top ~300 Mastodon servers