Aligning rag-gpt-admin repo code to open-kf-admin of rag-gpt code

[fp-99]

Hi!
I'm learning a lot from the open-gpt project.

However, I've noticed that the rag-gpt-admin code is not aligned with the admin console present in the rag-gpt repo.
In fact, for example, in the case of the Source tab, the local file upload funcionality is missing and the Files.tsx component is different from the one present in the rag-gpt repo.

It would be awesome if these differences could be solved in the rag-gpt-admin repo. This would enable peers to work on the repo and to read the code easily (which is not possible from the main rag-gpt repo as code for the admin console is minified).

Thanks for the attention!