Add GitHub Actions workflow for documentation

Author: chris-day

.github/workflows/docs.yml

@@ -0,0 +1,62 @@
+name: Build & Publish Documentation
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "docs-pages"
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install documentation dependencies
+        run: |
+          pip install \
+            mkdocs \
+            mkdocs-material \
+            mkdocs-network-graph-plugin \
+            mkdocs-minify-plugin \
+            mkdocs-git-revision-date-localized-plugin \
+            mkdocs-privacy
+
+      - name: Build MkDocs site
+        run: |
+          mkdocs build --strict
+
+      - name: Upload Pages artefact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: site
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4
+