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

test/_data/authors.yml

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+# Authors
+
+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"
+  google_plus : "BillyRick"
+
+Cornelius Fiddlebone:
+  name        : "Cornelius Fiddlebone"
+  email       : "cornelius@thewhip.com"
+  bio         : "I ordered what?"
+  avatar      : "/assets/images/bio-photo.jpg"
+  twitter     : "rhymeswithsackit"
+  google_plus : "CorneliusFiddlebone"

test/_data/navigation.yml

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+# main links links
+main:
+  - title: "Quick-Start Guide"
+    url: https://mmistakes.github.io/minimal-mistakes/docs/quick-start-guide/
+  - title: "About"
+    url: https://mmistakes.github.io/minimal-mistakes/about/
+  - title: "Sample Posts"
+    url: /year-archive/
+  - title: "Sample Collections"
+    url: /collection-archive/
+  - title: "Sitemap"
+    url: /sitemap/

test/_data/ui-text.yml

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+# User interface text and labels
+
+# English (default)
+# -----------------
+en: &DEFAULT_EN
+  page                       : "Page"
+  pagination_previous        : "Previous"
+  pagination_next            : "Next"
+  breadcrumb_home_label      : "Home"
+  breadcrumb_separator       : "/"
+  toc_label                  : "On This Page"
+  ext_link_label             : "Direct Link"
+  less_than                  : "less than"
+  minute_read                : "minute read"
+  share_on_label             : "Share on"
+  meta_label                 :
+  tags_label                 : "Tags:"
+  categories_label           : "Categories:"
+  date_label                 : "Updated:"
+  comments_label             : "Leave a Comment"
+  comments_title             : "Comments"
+  more_label                 : "Learn More"
+  related_label              : "You May Also Enjoy"
+  follow_label               : "Follow:"
+  feed_label                 : "Feed"
+  powered_by                 : "Powered by"
+  website_label              : "Website"
+  email_label                : "Email"
+  recent_posts               : "Recent Posts"
+  undefined_wpm              : "Undefined parameter words_per_minute at _config.yml"
+  comment_form_info          : "Your email address will not be published. Required fields are marked"
+  comment_form_comment_label : "Comment"
+  comment_form_md_info       : "Markdown is supported."
+  comment_form_name_label    : "Name"
+  comment_form_email_label   : "Email address"
+  comment_form_website_label : "Website (optional)"
+  comment_btn_submit         : "Submit Comment"
+  comment_btn_submitted      : "Submitted"
+  comment_success_msg        : "Thanks for your comment! It will show on the site once it has been approved."
+  comment_error_msg          : "Sorry, there was an error with your submission. Please make sure all required fields have been completed and try again."
+  loading_label              : "Loading..."
+en-US:
+  <<: *DEFAULT_EN