Corvimae's Better SRC wót Corvimae

Applies the following changes to the speedrun.com user interface:
- Changes the leaderboard page to a vertical tab layout (see https://twitter.com/Corvimae/status/1448696820574691336/photo/1)
- Makes important information on the moderator hub larger and more prominent.
- Hides comments.
- Replaces the icons in the Recent Runs widget to show text instead.
- Compacts the profile page and adds row shading to better delineate between games.

Source: https://github.com/Corvimae/better-src-extension