Documentation links broken

[shrink]

Bug Description

The docs have been restructured in #3392 but it doesn't look like any equivalent changes were made to the documentation's URL structure. Google "zustand" + any keyword (e.g: "zustand middleware") and the links Google returns are probably broken, e.g:

https://zustand.docs.pmnd.rs/middlewares/redux -> 404

Reviewing the changes, it looks like the simplest way would be to set up redirects in the next.config.mjs, e.g:

{
  source: '/getting-started/:path*',
  destination: '/learn/getting-started/:path*',
  permanent: false,
},
{
  source: '/middlewares/:path*',
  destination: '/reference/middlewares/:path*',
  permanent: false,
},
{
  source: '/migrations/:path*',
  destination: '/reference/migrations/:path*',
  permanent: false,
},
{
  source: '/integrations/:path*',
  destination: '/reference/integrations/:path*',
  permanent: false,
},
{
  source: '/hooks/:path*',
  destination: '/reference/hooks/:path*',
  permanent: false,
},
{
  source: '/apis/:path*',
  destination: '/reference/apis/:path*',
  permanent: false,
},

I recommend starting out with non-permanent redirects because permanent redirects are very difficult to undo due to caching. Switching to permanent redirects once you're happy everything is working in production is good.

A good idea is to also add some information to the 404 page. Right now it's a generic 404 page so it is not obvious to visitors that the page may still exist but in a new location.

Reproduction Link

https://zustand.docs.pmnd.rs/middlewares/redux

cc @dbritto-dev

[dbritto-dev]

@shrink I'll take care of that