Rewrite the project in TypeScript

[HelenOne]

Problem description

JavaScript is currently being used

Proposed solution

You need to translate the project to TypeScript - create a list of files with JS in the form of a checklist and gradually add typing there. Several developers can work on the task at the same time

[kodsurfer]

• [ ] api/index.js
• [ ] data/banner.js
• [ ] data/config.js
• [ ] pages/index.js
• [ ] pages/404.js
• [ ] pages/[name].js

[kodsurfer]