Bootstrap-only ERP starter pages

Files:
- index.html: dashboard page
- blank.html: general page layout
- assets/css/bootstrap.min.css: original Bootstrap 5 CSS
- assets/js/bootstrap.bundle.min.js: original Bootstrap 5 JS bundle

These pages avoid the Adminator-specific utility classes such as peer, mT-30, bgc-white, bd, and similar theme classes. The markup uses Bootstrap classes and components directly.
