Documentation site based on mkdocs and Read the Docs

Ref https://github.com/roboll/helmfile/issues/1824
Ref https://github.com/roboll/helmfile/issues/1755

.readthedocs.yaml

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+version: 2
+
+mkdocs:
+  configuration: mkdocs.yml
+  fail_on_warning: false
+
+python:
+   install:
+   - requirements: docs/requirements.txt

docs/contributing.md

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+../CONTRIBUTING.md

docs/index.md

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+../README.md

docs/license.md

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+../LICENSE

docs/requirements.txt

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+Babel==2.9.1
+click==8.1.2
+ghp-import==2.0.2
+gitdb==4.0.9
+GitPython==3.1.27
+importlib-metadata==4.11.3
+Jinja2==3.1.1
+Markdown==3.3.6
+MarkupSafe==2.1.1
+mergedeep==1.3.4
+mkdocs==1.3.0
+mkdocs-git-revision-date-localized-plugin==1.0.1
+packaging==21.3
+pyparsing==3.0.7
+python-dateutil==2.8.2
+pytz==2022.1
+PyYAML==6.0
+pyyaml_env_tag==0.1
+six==1.16.0
+smmap==5.0.0
+watchdog==2.1.7
+zipp==3.7.0

docs/users.md

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+../USERS.md

mkdocs.yml

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+# Test this locally with:
+#   $ docker run --rm -it -v $(pwd):$(pwd) --workdir $(pwd) python:3 bash
+#   # pip install -r docs/requirements.txt
+#   # mkdocs serve
+#   # mkdocs build
+#   $ ls -lah site/
+site_name: helmfile
+site_author: Helmfile Authors
+
+repo_name: helmfile/helmfile/
+repo_url: https://github.com/helmfile/helmfile/
+edit_uri: ''
+
+docs_dir: docs
+
+nav:
+  - Home: index.md
+  - Getting Started:
+    - Paths Overview: paths.md
+  - Advanced Features:
+    - Best Practices Guide: writing-helmfile.md
+    - Advanced Features: advanced-features.md
+    - Secrets: remote-secrets.md
+    - Shared Configuration Across Teams: shared-configuration-across-teams.md
+  - About:
+    - Users: users.md
+    - License: license.md
+    - Contributing: contributing.md
+
+theme:
+  name: readthedocs
+  features:
+    - navigation.tabs
+  collapse_navigation: false
+  hljs_languages:
+    - yaml
+    - dockerfile
+
+markdown_extensions:
+  # meta, toc, table and fenced_code extensions are included by default
+  - extra
+  - admonition
+  - smarty
+  - sane_lists
+  - nl2br
+  - toc:
+      permalink: true
+
+plugins:
+  - search
+  - git-revision-date-localized:
+      type: date
+      fallback_to_build_date: true