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/2012-03-15-layout-author-override.md

@@ -0,0 +1,38 @@
+---
+title: "Layout: Author Override"
+author: Billy Rick
+excerpt: "A post to test author overrides using a data file."
+---
+
+Sites that may have content authored from various individuals can be accommodated by using [data files](https://jekyllrb.com/docs/datafiles/).
+
+To attribute an author to a post or page that is different from the site author specified in `_config.yml`:
+
+**Step 1.** Create `_data/authors.yml` and add authors using the following format. Anything variables found under `author` in `_config.yml` can be used (e.g. `name`, `avatar`, `uri`, social media profiles, etc.).
+
+```yaml
+# /_data/authors.yml
+
+Billy Rick:
+  name: "Billy Rick"
+  uri: "http://thewhip.com"
+  email: "billy@rick.com"
+  bio: "What do you want, jewels? I am a very extravagant man."
+  avatar: "/assets/images/bio-photo-2.jpg"
+  twitter: "extravagantman"
+
+Cornelius Fiddlebone:
+  name: "Cornelius Fiddlebone"
+  email: "cornelius@thewhip.com"
+  bio: "I ordered what?"
+  avatar: "/assets/images/bio-photo.jpg"
+  twitter: "rhymeswithsackit"
+```
+
+**Step 2.** Assign one of the authors in `authors.yml` to a post or page you wish to override the `site.author` with. 
+
+Example: To assign `Billy Rick` as an author for a post the following YAML Front Matter would be applied:
+
+```yaml
+author: Billy Rick
+```