Use Next.js pages for existing routes

[mtfranchetto]

Description

All the existing pages were created before introducing Next.js. To take advantage of the outstanding capabilities of Next.js we should detach the existing pages from react-router-dom and move them under the pages directory, which is where Next.js triggers the routing.

The old router is configured in this file and every route must be moved under pages.
Please refer to this Next.js guide for more info on the pages functionality.

N.B. When moving pages one thing to look out for is how path params are injected into the components: the hooks used by Next.js are different from the one used by react-router-dom.