Add GitHub Pages documentation deployment workflow

Author: AriajSarkar

.github/workflows/docs.yml

@@ -0,0 +1,36 @@
+name: Deploy Documentation
+
+on:
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pages: write
+  id-token: write
+
+jobs:
+  build-docs:
+    name: Build and Deploy Documentation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - uses: dtolnay/rust-toolchain@stable
+      
+      - uses: Swatinem/rust-cache@v2
+        with:
+          cache-on-failure: true
+      
+      - name: Build documentation
+        run: |
+          cargo doc --no-deps --all-features --document-private-items
+          echo '<meta http-equiv="refresh" content="0; url=crabgraph/index.html">' > target/doc/index.html
+      
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./target/doc
+          force_orphan: true