* Add `{{ content }}` to `home` layout
Allow the author to add content which will appear above the list of
recent posts. This also allows the `home` layout to be extended.
Add text to index.html in tests to indicate that the content appears in
the correct spot.
* Add paragraph markup
Since this is a HTML file, proper paragraph markup is needed.
- Jekyll ignore `/docs` and `/test` folders when using from root
- Update Staticman config to point to correct branch and data file location
- Replace `{{ base_path }}` references with `absolute_url` filter
- Update documentation