chore: setup github pages docs deploy

.github/workflows/ghpages.yml

@@ -0,0 +1,52 @@
+name: Documentation
+
+on:
+  push:
+    branches: ["master"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - id: lean-action
+        name: Build and test
+        uses: leanprover/lean-action@v1
+        with:
+          lint-module: TTFPI
+          use-github-cache: false
+      - name: Build Doc
+        run: |
+          lake -R -Kenv=dev update
+          lake -R -Kenv=dev build TTFPI:docs
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: './.lake/build/doc'
+
+  deploy:
+    needs: build
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4