Add jekyll-rtd-theme

docs/Gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "jekyll-rtd-theme"
+
+gem "github-pages", group: :jekyll_plugins

docs/Makefile

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+default:
+	@bundle install
+
+update:
+	@bundle update
+
+clean:
+	@bundle exec jekyll clean
+
+server: clean
+	@bundle exec jekyll server
+
+build: clean
+	@bundle exec jekyll build --profile

docs/_config.yml

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+title: mermaid
+lang: en
+description: Markdownish syntax for generating flowcharts, sequence diagrams, class diagrams, gantt charts and git graphs.
+
+theme: jekyll-rtd-theme
+# remote_theme: rundocs/jekyll-rtd-theme
+
+sass:
+  style: compressed
+
+copyright:
+  revision: true
+
+edit: true
+addons_branch: true
+
+addons:
+  - github
+  - i18n
+  - analytics
+
+readme_index:
+  with_frontmatter: true
+
+exclude:
+  - Makefile
+  - Gemfile
+  - Gemfile.lock