docs: migrate to mdbook

.github/workflows/docs.yml

@@ -0,0 +1,43 @@
+name: Deploy Docs
+on:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  deploy-docs:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      pages: write
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install mdbook
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          jq_expr='.assets[] | select(.name | contains("x86_64-unknown-linux-gnu")) | .browser_download_url'
+          url=$(gh api repos/rust-lang/mdbook/releases/latest --jq "$jq_expr")
+          mkdir mdbook
+          curl -sSL "$url" | tar -xz -C mdbook
+          printf '%s/mdbook\n' "$PWD" >> "$GITHUB_PATH"
+
+      - name: Build Book
+        run: mdbook build docs
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/book
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4