docs: add mkdocs configuration and initial documentation

- Introduce mkdocs.yml for site configuration
- Create index.md with basic commands and project layout

These files are essential for generating and serving project documentation, enhancing accessibility and user experience.

docs/index.md

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+# Welcome to MkDocs
+
+For full documentation visit [mkdocs.org](https://www.mkdocs.org).
+
+## Commands
+
+* `mkdocs new [dir-name]` - Create a new project.
+* `mkdocs serve` - Start the live-reloading docs server.
+* `mkdocs build` - Build the documentation site.
+* `mkdocs -h` - Print help message and exit.
+
+## Project layout
+
+    mkdocs.yml    # The configuration file.
+    docs/
+        index.md  # The documentation homepage.
+        ...       # Other markdown pages, images and other files.

mkdocs.yml

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+site_name: SelfHost-Hub
+site_url: https://selfhost-hub.com
+theme:
+  name: material