style for table editing popup + misc stuffs

- add style for RES table editing popup
- move main RES selectors out of res/_stupid_fixes.scss
- enable flair by default
- switch position of cake icon and lock icon
- remove contest infobar style
- s/(\.btn)/button\1/
- remove (half-ass) nightmode compatibility out of userstyle.
  too many things cover. if anyone wants to add it back, feel free to
  make a pull request.