**build(demo): remove GitHub Pages workflow and streamline demo deployment**

### Changes:
- Removed `github-pages.yml` GitHub Actions workflow file.
- Updated `README.md`:
  - Added documentation for `npm run deploy:demo` to deploy the demo to GitHub Pages.
  - Updated the live demo link to reflect the repository's namespace change.
- Added `gh-pages` dependency (v6.3.0) in `package.json`.
- Introduced `deploy:demo` script in `package.json` for demo deployment.

### Purpose:
Streamlined the demo deployment process by removing the dedicated GitHub Pages workflow and replacing it with a manual deployment script (`npm run deploy:demo`). This enhances developer control while maintaining simplicity in deploying updates to the live demo.

.github/workflows/github-pages.yml

@@ -1,33 +0,0 @@
-name: Deploy to GitHub Pages
-
-on:
-  push:
-    branches:
-      - main  # Set this to the branch you want to deploy from
-
-permissions:
-  contents: read
-  pages: write
-  id-token: write
-
-jobs:
-  deploy:
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Setup Pages
-        uses: actions/configure-pages@v4
-
-      - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
-        with:
-          path: './examples'  # Upload the examples directory
-
-      - name: Deploy to GitHub Pages
-        id: deployment
-        uses: actions/deploy-pages@v4