Add deployment

.github/workflows/deploy-ci.yml

@@ -0,0 +1,26 @@
+name: Deploy
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout tree
+        uses: actions/checkout@v4
+
+      - name: Set-up OCaml
+        uses: ocaml/setup-ocaml@v3
+        with:
+          ocaml-compiler: "5.1.1"
+      - run: opam install . --deps-only
+      - run: opam exec -- dune build --profile=release
+      - run: opam exec -- dune exec bin/exe -- build --target ./_site
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./_site