[WIP] Categories work, need to link them in
[WIP] Link in articles and events (and tidy).
Add some styling and a few fixups.
Merge pull request #2 from fhcrcio/dev

Add categories and category index pages.
Remove plugin and hardcode some categories.
Merge pull request #3 from fhcrcio/dev

Add "Articles" and "Events" categories and index pages for each.