Make it clear that other LLMs can be used

[arty-hlr]

Hi, in the readme you wrote:

To use RamiGPT's capabilities, you'll need an OpenAI API key

This is not true as you are using the openai SDK and any openAI compatible API will work with it if you specify the base URL. Could you maybe add in the readme that this is possible and a short guide to change the base URL?

[jimccadm]

Yes. Agree 100%. This should be able to work with Ollama and testing with various offline LLMs is going to be rather cool too.

[M507]

I second that. I will try to do that when I have time. If you can tackle that, feel free to open a PR