DIMITRI: Unify nav and headers across legacy pages (Fixes #62)

Fixes #62. Notably:

- A new tag (`include_static_file`) is used to include an Angular bundle to drive the new header and footer.
- Red Bull headers and footers removed.
- Some legacy CSS classes removed in favor of new Angular app styles.
I'm just being consistent with theme_base.html in the hopes that it'll be refactored properly one day.