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/assets/css/main.scss

@@ -0,0 +1,39 @@
+---
+---
+
+/*
+ *    Minimal Mistakes Jekyll Theme
+ *
+ *  - Michael Rose
+ *  - mademistakes.com
+ *  - https://twitter.com/mmistakes
+ *
+*/
+
+@import "vendor/breakpoint/breakpoint"; // media query mixins
+@import "variables";
+@import "mixins";
+@import "vendor/susy/susy";
+
+@import "reset";
+@import "base";
+
+@import "utilities";
+@import "animations";
+@import "tables";
+@import "buttons";
+@import "notices";
+@import "masthead";
+@import "navigation";
+@import "footer";
+@import "syntax";
+
+@import "forms";
+
+@import "page";
+@import "archive";
+@import "sidebar";
+
+@import "vendor/font-awesome/font-awesome";
+@import "vendor/magnific-popup/magnific-popup";
+@import "print";