Pages feature is finished.

Pages were added by re-utilizing most of what is in for posts. A page is a
post which has a is_page property set to true. Pages will display in the
top menu. They also won't appear in the posts listings.
Minor changes. Styles, pagination and comments.

- Implementation of comments just started.
- Styles undergone some changes for a, attempted, cleaner style.
- Pagination is in place for list of posts in the home page.