docs: add MkDocs documentation with Material theme and GitHub Pages deploy

.github/workflows/docs.yml

@@ -0,0 +1,28 @@
+name: docs
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - docs/**
+      - metaorm/**
+      - mkdocs.yml
+      - .github/workflows/docs.yml
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v3
+        with:
+          version: "latest"
+      - name: Sync dependencies
+        run: uv sync
+      - name: Deploy to GitHub Pages
+        run: uv run mkdocs gh-deploy --force