docs: move website from separate repo into docs/website by antonreshetov · Pull Request #716 · massCodeIO/massCode

@antonreshetov

- Migrate VitePress site from masscode.io repo
- Remove snippets section (content and nav)
- Replace sass with native CSS nesting
- Remove element-plus, codemirror dependencies
- Add generate-assets script to build download links from package.json version
- Add GitHub Actions workflow for deploy via rsync
- Add docs:dev, docs:build, docs:preview scripts