upgraded dependencies, code and README

[mickume]

Upgraded python libraries:
transformers 4.35.2 -> 4.38.1
llama-index 0.9.2 -> 0.10.14
streamlit 1.27.2 -> 1.31.0

Updated code to match new libraries.

[sroecker]

Thanks! LGTM. I was aware of the plugin changes but not of Settings.
FYI I haven't touched this repo in a while but will probably change the embedding to use the Ollama embedding API once llama.cpp supports BERT models ggerganov/llama.cpp#2872