some fixes and (unused) temporary flair style

- fix RES' gfycat inline preview so it doesn't have its own callout
- hide contents of `.flat-list > li` instead of `.flat-list > li` itself
  to prevent flair popup disappearing when mouse is out of the link entry
- a bit smaller nsfw tag
- fix RES image expando to always use our style when it's expanded,
  collapsed, and then expanded again
- add temporary flair style but it's disabled for now
- move rules inside scss/terriblename.scss to scss/_basic.scss.
  scss/terriblename.scss will only contain imports from now
wikiiiiiiii

- added style for wiki pages, toolbar, toc, and revision/history.
- use our button style for input[type=submit]
- make raised box a generic class and put it in scss/_basic.scss along
  with engraved box
- use chain link icon for unmoderated links and use the clock icon for
  revision. can't find a good icon to represent revision.
- make $bright-yellow brighter
- fix default $serif fallback to actually 'serif' (was 'sans-serif'
  previously :p)
- remove useless button style for h5 > a. it was supposed to be just a
  test but i accidentally committed it :D
- miscellaneous small changes (like style for hr and other markdown
  stuffs)