Admin page

**Needs to be squashed before merge**

Sorry for the big PR. But this scaffolds out the basic HTML for the entire admin section of the site. Go click around.

Notes:

- None of the forms work. But the links to click into the detail page work (like items in lists and stuff), and back buttons and stuff.
- The data is hardcoded in the controller in the routes. This is just temporary, obviously.
- Pagination doesn't work. This is a bigger problem I wanted to solve separately.

What's next?

- Tidying up the HTML a bit. The update to Bootstrap messed up the templates a bit, as you can see.
- Layering in functionality. It needs to work (duh :P)
- Maybe enhancements to the interface to make it less tedious to use, if time permits.