Docs and example generator support for react-router-7

[mkbctrl]

The latest RR brings in framework mode: https://reactrouter.com/start/modes

In the framework mode we have different router (Hybrid) and routes are managed like this: https://reactrouter.com/start/framework/routinh

Example app generators nor the documentation document the setup flow properly, leading to quite some frustration when trying to marry those two solutions.

I believe RR7 deserves a dedicated space same as Next.js, where some framework related specifics will be well documented.

[ACCSCI]

Same problems come up here. Updated Doc needed.