chore: remove react-scripts, use vite

[rluders]

This PR does a code clean and updates our tools:

• Replace react-scripts with vite (faster, better, modern, less trash)
• Replace jest with vitest (faster, better fit to use with vite)
• Updates flowbite, flowbite-react and tailwindcss
• Removes some meaningless unit tests, to give space to better unit tests
• Improves ESLint configuration
• Improves Prettier configuration
• Prettify the code
• Moves mock_server/ to tools/mockserver/
• Moves scripts/translations.js to tools/translations/index.js
• Update README with new instructions (yarn starts now runs the mock and the react app)
• Removes some old local components (we are using the flowbite ones)

Out of scope

• Fix lint-reported issues
• Fix flowbite-react styled/themed components