Add initial React app

[amehta-scottlogic]

Description

Setups the React part of our repo with the following features:

• Run locally with vite
• Two initial components as a starting point for future work
• Use of react router to route to these components
• Unit tests (jest) with coverage threshold (and report below)
• Linting
• Integration with github actions pipeline
• e2e with playwright setup

Reuses/replaces the existing UI folder which only had sample e2e tests

Screenshots

[github-actions[bot]]

Coverage report for air-quality-ui

St.:grey_question:	Category	Percentage	Covered / Total
🟢	Statements	100%	6/6
🟢	Branches	100%	0/0
🟢	Functions	100%	2/2
🟢	Lines	100%	6/6

Test suite run success

2 tests passing in 2 suites.

Report generated by 🧪jest coverage report action from 6781bb9ad2bac0b4f192c535d8b51ad35140a996