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/_docs/12-pages.md

@@ -0,0 +1,43 @@
+---
+title: "Working with Pages"
+permalink: /docs/pages/
+excerpt: "Suggestions and Front Matter defaults for working with pages."
+modified: 2016-11-03T11:13:12-04:00
+---
+
+To better organize all of your pages you can centralize them into a single location similar to posts and collections.
+
+**Step 1:** Start by placing pages (`.md` or `.html` files) into a `_pages` directory. Meaningfully naming files should be the goal. Avoid patterns like `/about/index.md` as it makes distinguishing between multiple `index.md` files harder.
+
+```bash
+sample-project
+└── _pages/
+    ├── 404.md               # custom 404 page
+    ├── about.md             # about page
+    └── contact.md           # contact page
+```
+
+**Step 2:** Include pages to be sure Jekyll "sees" and processes the files inside of `_pages`. Add `include: ["_pages"]` to `_config.yml`.
+
+**Step 3:** Assign permalink overrides in the YAML Front Matter of each.
+
+Examples:
+
+| filename            | permalink              |
+| --------            | ---------              |
+| _pages/about.md     | `permalink: /about/`   |
+| _pages/home.md      | `permalink: /`         |
+| _pages/contact.md   | `permalink: /contact/` |
+
+**Recommended Front Matter Defaults:**
+
+```yaml
+defaults:
+  # _pages
+  - scope:
+      path: ""
+      type: pages
+    values:
+      layout: single
+      author_profile: true
+```