Migrate wiki to docs dir

docs/.gitignore

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+# Jekyll specific ignores
+vendor/
+.bundle/
+Gemfile.lock
+_site/
+.sass-cache/

docs/Gemfile

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+source "https://rubygems.org"
+ruby RUBY_VERSION
+
+# Hello! This is where you manage which Jekyll version is used to run.
+# When you want to use a different version, change it below, save the
+# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
+#
+#     bundle exec jekyll serve
+#
+# This will help ensure the proper Jekyll version is running.
+# Happy Jekylling!
+gem "jekyll", "3.2.1"
+
+# This is the default theme for new Jekyll sites. You may change this to anything you like.
+gem "minima"
+
+# Table of contents
+gem 'jekyll-toc'
+
+# If you want to use GitHub Pages, remove the "gem "jekyll"" above and
+# uncomment the line below. To upgrade, run `bundle update github-pages`.
+# gem "github-pages", group: :jekyll_plugins
+
+# If you have any plugins, put them here!
+# group :jekyll_plugins do
+#   gem "jekyll-github-metadata", "~> 1.0"
+# end