Feat/integrate server

[louvrecly]

Descriptions

• integrate the frontend UI with the backend server with minimal UI

Stories

• [x] create simple UI to display data fetched from the server
• [x] update README.md
• [x] create Loading component and wrap fetched data with Suspense in the Home page

Notes

⚠️ A new env variable NEXT_PUBLIC_BET_BETTER_API should be added to the .env.local file in the root directory in order to run the app in local.