Adding upstream version 0.13.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

mkdocs.yml

@@ -0,0 +1,17 @@
+site_name: Gitlint
+site_description: Linting for your git commit messages
+site_url: http://jorisroovers.github.io/gitlint/
+repo_url: https://github.com/jorisroovers/gitlint
+nav:
+    - Home: index.md
+    - Configuration: configuration.md
+    - Rules: rules.md
+    - Contrib Rules: contrib_rules.md
+    - User Defined Rules: user_defined_rules.md
+    - Contributing: contributing.md
+    - Changelog: https://github.com/jorisroovers/gitlint/blob/master/CHANGELOG.md
+
+markdown_extensions: [admonition]
+theme: readthedocs
+strict: true
+extra_css: [extra.css]