Remove framework selector from docs

[oscartbeaumont]

Move it to actual command which is wayyy more common.

Also keep it in localStorage so it's the same if you come back.

[k-hashiura]

Hello, thank you for developing an amazing library.

While reading the documentation, I noticed a performance issue caused by an infinite loop in the framework selector section. It seems that the useEffect in Switchers.tsx is causing the infinite loop.

I am commenting here because this issue seems to be related to the problem described in this issue.

Apologies if you're already working on this.

[oscartbeaumont]

Thanks for reporting. It is being tracked as #302, I just haven't had the time to fix it yet. Would love a PR if you have the time!