Adds the github workflows

.github/workflows/eleventy_build.yml

@@ -0,0 +1,22 @@
+name: Eleventy Build
+on:
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  build_deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@main
+      - name: Build
+        uses: TartanLlama/[email protected]
+        with:
+          install_dependencies: true
+          args: --pathprefix 2023
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          publish_dir: _site
+          publish_branch: gh-pages
+          github_token: ${{ secrets.GITHUB_TOKEN }}