add a GHA to preview PRs

.github/.gitignore

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+*.html

.github/workflows/preview.yml

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+name: Quarto Preview
+
+on:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - closed
+
+jobs:
+  build-deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Setup Quarto
+        uses: quarto-dev/quarto-actions/setup@v2
+
+      - name: Render
+        uses: quarto-dev/quarto-actions/render@v2
+
+      - name: Deploy PR Preview
+        uses: rossjrw/[email protected]
+        with:
+          source-dir: ./_book/