Revert "Convert dropdowns to proper buttons."

This reverts commit 17da848f965115104ae6e00c4e2380051c5c6d98.

Revert to previous navbar, as that's how it's specified in the bootstrap docs.
Remove links to non-existent pages from navbar.
Merge navbar rules.
Use config debug to trigger debug builds with sass, compressors etc.
Refactor to use default bootstrap classes.
Kill override for text-center and properly use the "strong" tag.
Heavy refactor of CSS, use SASS to properly stylize stylesheets.