Flask-vite

<!-- 0 -->🚀 Features

- Use vite_tags() instead of vite_header_tags()

<!-- 1 -->🐛 Bug Fixes

- Use Vite properl (WIP).
- Fix demo.
- Use actual vite config for starter files.

<!-- 2 -->🚜 Refactor

- Remove useless demo files

<!-- 1 -->🐛 Bug Fixes

- CORS issue.

<!-- 6 -->🧪 Testing

- Upgrade pyanalyze and tweak config.

<!-- 0 -->🚀 Features

- Caching for static assets.

<!-- 1 -->🐛 Bug Fixes

- Proper tags for production.

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* Ensure caching of assets.

<!-- 0 -->🚀 Features

- Insert proper tags.

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