Docs: various Flask related

[euri10]

Summary

• in https://docs.litestar.dev/latest/migration/flask.html it is weird:

<usage/requests/file-uploads>

• https://docs.litestar.dev/latest/migration/flask.html#static-files it contains the old way of creating statics, could be updated

maybe more, WIP ;)

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[euri10]

the redirect is plain wrong in Litestar, should say
return Redirect(path="/") instead of return Redirect(path="index") or make use of url_for or route_reverse

https://docs.litestar.dev/2/migration/flask.html#redirects