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/_data/navigation.yml

@@ -0,0 +1,99 @@
+# example navigation
+foo:
+  - title: "Parent Link 1"
+    url: /parent-1-page-url/
+    children:
+      - title: "Child Link 1"
+        url: /child-1-page-url/
+      - title: "Child Link 2"
+        url: /child-2-page-url/
+
+  - title: "Parent Link 2"
+    url: /parent-2-page-url/
+    children:
+      - title: "Child Link 1"
+        url: /child-1-page-url/
+      - title: "Child Link 2"
+        url: /child-2-page-url/
+      - title: "Child Link 3"
+        url: /child-3-page-url/
+
+
+# main links links
+main:
+  - title: "Quick-Start Guide"
+    url: /docs/quick-start-guide/
+
+  - title: "About"
+    url: /about/
+
+  - title: "Sample Posts"
+    url: /year-archive/
+
+  - title: "Sample Collections"
+    url: /collection-archive/
+
+  - title: "Terms & Privacy Policy"
+    url: /terms/
+
+
+# documentation links
+docs:
+  - title: Getting Started
+    children:
+      - title: "Quick-Start Guide"
+        url: /docs/quick-start-guide/
+      - title: "Structure"
+        url: /docs/structure/
+      - title: "Installation"
+        url: /docs/installation/
+      - title: "Upgrading"
+        url: /docs/upgrading/
+
+  - title: Customization
+    children:
+      - title: "Configuration"
+        url: /docs/configuration/
+      - title: "Overriding Theme Defaults"
+        url: /docs/overriding-theme-defaults/
+      - title: "Navigation"
+        url: /docs/navigation/
+      - title: "UI Text"
+        url: /docs/ui-text/
+      - title: "Authors"
+        url: /docs/authors/
+      - title: "Layouts"
+        url: /docs/layouts/
+
+  - title: Content
+    children:
+      - title: "Working with Posts"
+        url: /docs/posts/
+      - title: "Working with Pages"
+        url: /docs/pages/
+      - title: "Working with Collections"
+        url: /docs/collections/
+      - title: "Helpers"
+        url: /docs/helpers/
+      - title: "Utility Classes"
+        url: /docs/utility-classes/
+
+  - title: Extras
+    children:
+      - title: "Stylesheets"
+        url: /docs/stylesheets/
+      - title: "JavaScript"
+        url: /docs/javascript/
+
+  - title: Meta
+    children:
+      - title: "History"
+        url: /docs/history/
+      - title: "Contributing"
+        url: /docs/contributing/
+      - title: "Old 2.2 Docs"
+        url: /docs/docs-2-2/
+      - title: "License"
+        url: /docs/license/
+      - title: "Terms & Privacy Policy"
+        url: /terms/