Add GitHub Actions for Docusaurus deploy

Author: par4m

.github/workflows/deploy.yml

@@ -0,0 +1,35 @@
+name: Deploy Docusaurus to GitHub Pages
+
+on:
+  push:
+    branches:
+      - main # build and deploy whenever main is updated
+
+jobs:
+  build-deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write # allow pushing to gh-pages
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Build website
+        run: yarn build
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./build
+          publish_branch: gh-pages