Move gh-pages branch files into /docs and add test files

- 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

docs/_posts/2009-09-05-edge-case-no-yaml-title.md

@@ -0,0 +1,10 @@
+---
+categories:
+  - Edge Case
+tags:
+  - edge case
+  - layout
+  - title
+---
+
+This post has no title specified in the YAML Front Matter. Jekyll should auto-generate a title from the filename.