chore(docs): GitHub Actions Workflow for deploying docs to Pages

Allows for manual Actions Workflow run for deployment, not automatic. Can be run against a given release/tag.

Author: grega

.github/workflows/deploy-docusaurus.yml

@@ -0,0 +1,69 @@
+# .github/workflows/deploy-docusaurus.yml
+# This workflow deploys the Blockly documentation to GitHub Pages.
+# Run this manually after a release to publish updated documentation.
+
+name: Deploy Docusaurus to GitHub Pages
+
+on:
+  # To run: GitHub -> Actions -> "Deploy Docusaurus to GitHub Pages" -> Run workflow
+  # Optionally set `ref` to the release branch/tag; leave default to deploy `main`
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: 'Branch, tag, or commit SHA to deploy (defaults to main)'
+        required: false
+        default: 'main'
+        type: string
+
+# Sets the permissions for the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued
+# However, do not cancel in-progress runs as we want to allow these production deployments to complete
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout your repository
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.ref || 'main' }}
+          # Allow Docusaurus to view the full commit history (required for "last edited at <date> by <person>" functionality)
+          fetch-depth: 0
+      
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+          cache: 'npm'
+          cache-dependency-path: packages/docs/package-lock.json
+      
+      - name: Install dependencies
+        working-directory: ./packages/docs
+        run: npm ci
+
+      - name: Build the Docusaurus site
+        working-directory: ./packages/docs
+        run: npm run build
+      
+      - name: Setup GitHub Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload build artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./packages/docs/build
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4