Deploy slides to GitHub Pages

Add GitHub Actions to deploy slides to GitHub pages.

The deployment file was copied from the Slidev documentation and
updated to use the latest stable version of each action.

The NPM package manager was replaced with Yarn which is known to be
installed on the GitHub-hosted runners.

.github/workflows/deploy.yaml

@@ -0,0 +1,43 @@
+name: Deploy pages
+
+on:
+  workflow_dispatch: {}
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+
+      - name: Install dependencies
+        run: yarn install
+
+      - name: Build
+        run: yarn run build -- --base /from-ticket-to-pull-request/
+
+      - uses: actions/configure-pages@v4
+
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: dist
+
+      - name: Deploy
+        id: deployment
+        uses: actions/deploy-pages@v4