**ci(workflows): add GitHub Pages workflow for demo deployment with custom domain**

### Changes:
- Introduced `deploy-demo.yml` workflow in `.github/workflows/` to automate deployment to GitHub Pages:
  - Triggers on `main` branch pushes and manual workflow dispatch.
  - Includes steps for project setup, build, and deployment using `JamesIves/github-pages-deploy-action`.
- Added `examples/CNAME` with custom domain `www.soulcraft.com`.

### Purpose:
Streamlined and automated the deployment of the demo to GitHub Pages, ensuring efficient updates. Configured a custom domain for better branding and accessibility of the live demo.

.github/workflows/deploy-demo.yml

@@ -0,0 +1,33 @@
+name: Deploy Demo to GitHub Pages
+
+on:
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v3
+
+      - name: Setup Node.js 🔧
+        uses: actions/setup-node@v3
+        with:
+          node-version: '23'
+          cache: 'npm'
+
+      - name: Install dependencies 📦
+        run: npm ci
+
+      - name: Build project 🏗️
+        run: |
+          npm run build
+          npm run build:browser
+
+      - name: Deploy to GitHub Pages 🚀
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          folder: examples
+          branch: gh-pages