feat: misc fixes

[Pausbe]

• General
  • Various styling fixes on Recent Changes page
  • Fix white background appearing when zoomed in far
  • Added "embedvideo" changes so they aren't lost on wiki
  • Made VRCat (& VRRat) pettable again
• Header & Footer
  • Made Search Bar consistent with rest of theme
  • Fix notices notification background when initially seen
  • Improved account dropdown styling
  • Made footer colors consistent with rest of theme
• Editor
  • Made caution notices on source edit pages consistent with wiki noticeboxes
  • Add margin to "translate-edit-documentation" notice
  • Improved readability on "Special Characters & Help" section