ci: publish pages using Github Actions

.github/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch: # allows to be run manually
+  workflow_call: # when called from another workflow
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+      - name: Build site
+        run: |
+          mkdir -p _site
+          find . -maxdepth 1 -mindepth 1 -not -name _site -not -name '*.md' -not -name LICENSE -not -name .github -not -name .gitignore -not -name .git -exec cp -r '{}' _site \;
+      - name: Save built site for deploy
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: _site
+          retention-days: 7

.github/workflows/deploy.yml

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+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch: # allows to be run manually
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow one concurrent deployment
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  build:
+    uses: ./.github/workflows/build.yml
+  deploy:
+    if: github.ref == 'refs/heads/master'
+    needs: build
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - id: deployment
+        name: Deploy to GitHub Pages
+        uses: actions/deploy-pages@v4

.gitignore

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+_site