Ollama API support

[bgreene2]

This adds the ability to point at a model hosted on an Ollama installation instead of running the model within the app.

1. Added two commandline arguments (ollama-host, ollama-model)
2. Added Ollama modelfile to create the psyfighter model
3. Updated readme with instructions
4. Added requirements.txt to make installing dependencies with pip easier

Tested on my system, which is a PC running Windows 11 and WSL. The Ollama installation is in Windows, and the app was run in WSL.

[mateusz]

Thanks - this works well! However I've been playing downstream with using grammars (GBNF), and Ollama is not there yet for guided generation.

I might try looking at Outlines instead of GBNF, they integrate with llama.cpp, but unsure about ollama.

[thinking in progress]