General ability to post is in place.

Generally, posts can be created. However, much of the support for posting is
lacking. For example:

- Home page isn't showing the 10 most recent posts.
- Post body box accepts raw html.
- There is no comments support.
- If a post is created as a page, it's not yet added to the top menu.
- The 'about' menu item is still there as a fixed entry.
- ... (and so forth) ...

However, roughly, support for posts is in place. Later commits will fix these
issues.