**Chore(deploy-demo.yml): update node version and simplify steps**

- Use consistent node version syntax.
- Remove redundant dependency installation steps.
- Simplify build and deployment steps.

Author: hhfrancois

.github/workflows/deploy-demo.yml

@@ -32,15 +32,13 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: "20"
 
-      - name: Remove local split-button reference and install from npm
-        run: |
-          npm remove @softwarity/split-button
-          npm i @softwarity/split-button
+      - name: Install dependencies
+        run: npm ci
 
-      - name: Remove path mapping for demo
-        run: sed -i '/"paths"/,/}/d' projects/demo/tsconfig.app.json
+      - name: Build the library from source
+        run: npm run build
 
       - name: Build demo for GitHub Pages
         run: npm run build:demo -- --base-href /split-button/
@@ -51,7 +49,7 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with:
-          path: './dist/demo/browser'
+          path: "./dist/demo/browser"
 
       - name: Deploy to GitHub Pages
         id: deployment