feat: add docs

.github/workflows/BUILD.bazel

@@ -1,3 +1,6 @@
 package(default_visibility = ["//visibility:public"])
 
-exports_files(["ci.yml"])
+exports_files([
+    "ci.yml",
+    "pages.yml",
+])

.github/workflows/pages.yml

@@ -0,0 +1,51 @@
+name: Docs Pages
+
+on:
+  push:
+    branches: ["main"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    env:
+      USE_BAZEL_VERSION: 9.0.0
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: bazel-contrib/setup-bazel@0.15.0
+
+      - name: Generate rule docs
+        run: |
+          bazel build //docs:rules_md
+          cp bazel-bin/docs/rules.md docs/rules.md
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Build with Jekyll
+        uses: actions/jekyll-build-pages@v1
+        with:
+          source: docs
+          destination: _site
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: _site
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4