ci: update deploy workflow for Astro website

- Install both root and website dependencies
- Run website:data to generate JSON files
- Build Astro site in website directory
- Deploy from website/dist

.github/workflows/deploy-website.yml

@@ -1,5 +1,5 @@
 # GitHub Pages deployment workflow
-# Builds the website data and deploys to GitHub Pages
+# Builds the Astro website and deploys to GitHub Pages
 
 name: Deploy Website to GitHub Pages
 
@@ -46,11 +46,19 @@ jobs:
           node-version: '20'
           cache: 'npm'
 
-      - name: Install dependencies
+      - name: Install root dependencies
         run: npm ci
 
+      - name: Install website dependencies
+        run: npm ci
+        working-directory: ./website
+
       - name: Generate website data
-        run: npm run website:build-data
+        run: npm run website:data
+
+      - name: Build Astro site
+        run: npm run build
+        working-directory: ./website
 
       - name: Setup Pages
         uses: actions/configure-pages@v5
@@ -58,7 +66,7 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with:
-          path: './website'
+          path: './website/dist'
 
   # Deployment job
   deploy: