docs: add initial files for mkdocs support

docs/_overrides/main.html

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+<!--
+  Copyright (c) 2016-2022 Martin Donath <martin.donath@squidfunk.com>
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to
+  deal in the Software without restriction, including without limitation the
+  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+  sell copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+  IN THE SOFTWARE.
+-->
+
+{% extends "base.html" %}
+
+<!-- Custom front matter -->
+{% block extrahead %}
+
+  <!-- Extra style sheets (can't be set in mkdocs.yml due to content hash) -->
+  <link
+    rel="stylesheet"
+    href="{{ 'overrides/assets/stylesheets/main.css' | url }}"
+  />
+{% endblock %}
+
+<!-- Announcement bar -->
+{% block announce %}
+  <a href="https://twitter.com/dokku">
+    For updates follow <strong>@dokku</strong> on
+    <span class="twemoji twitter">
+      {% include ".icons/fontawesome/brands/twitter.svg" %}
+    </span>
+    <strong>Twitter</strong>
+  </a>
+{% endblock %}
+
+<!-- Theme-related JavaScript -->
+{% block scripts %}
+  {{ super() }}
+
+  <!-- Extra JavaScript (can't be set in mkdocs.yml due to content hash) -->
+  <script src="{{ 'overrides/assets/javascripts/bundle.js' | url }}"></script>
+{% endblock %}

mkdocs.yml

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+---
+# yaml-language-server: $schema=https://squidfunk.github.io/mkdocs-material/schema.json
+
+markdown_extensions:
+  - admonition
+  - attr_list
+  - footnotes
+  - md_in_html
+  - pymdownx.details
+  - pymdownx.emoji:
+      emoji_generator: !!python/name:materialx.emoji.to_svg
+      emoji_index: !!python/name:materialx.emoji.twemoji
+  - pymdownx.highlight:
+      anchor_linenums: true
+  - pymdownx.inlinehilite
+  - pymdownx.snippets
+  - pymdownx.superfences
+  - pymdownx.tabbed:
+      alternate_style: true
+  - tables
+
+repo_url: https://github.com/dokku/dokku
+
+site_dir: site
+site_name: Dokku Documentation
+site_url: https://dokku.com/docs/
+
+extra:
+  social:
+    - icon: fontawesome/solid/bug
+      link: https://github.com/dokku/dokku/issues
+    - icon: fontawesome/solid/cart-shopping
+      link: https://dokku.dpdcart.com/cart/add?product_id=217344&method_id=236878
+  version:
+    provider: mike
+
+theme:
+  custom_dir: docs/_overrides
+  favicon: assets/favicons/favicon-96x96.png
+  features:
+    - navigation.instant
+    - navigation.sections
+    - navigation.tabs
+    - navigation.top
+    - search.highlight
+  homepage: https://dokku.com
+  icon:
+    admonition:
+      tip: fontawesome/solid/wand-magic-sparkles
+  logo: assets/dokku-logo.svg
+  name: material
+  palette:
+    # Palette toggle for light mode
+    - media: "(prefers-color-scheme: light)"
+      scheme: default
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
+
+    # Palette toggle for dark mode
+    - media: "(prefers-color-scheme: dark)"
+      scheme: slate
+      toggle:
+        icon: material/brightness-4
+        name: Switch to light mode
+
+plugins:
+  - search
+  - exclude:
+      glob:
+        - _build/Dockerfile
+        - _build/entrypoint
+        - _build/requirements.txt
+        - home.html
+        - template.html
+
+extra_css:
+  - assets/extra.css