Docs: Migrating to Litestar from Django

[fkromer]

Summary

Would be great to have some summary for Django users about what's possible with Litestar already w.r.t. functionality used in a typical Django project in the docs.

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[Alc-Alc]

Moved this to Litestar, as this is where other migrations docs are present, any PRs would end up here https://github.com/litestar-org/litestar/tree/main/docs/migration