Docker Image for RAG applications

[ElNandes]

Hello,

The image build on top of the ml-notebooks images and includes the following additions:

• ollama server to download and use llms locally
• llama-index and its dependencies, and chromadb
• A script chroma_fix.sh that fixes some dependency issues with chromadb

Regards
Elanton

[mhwasil]

Just saw this PR!
I think it's better to integrate this to the nlp-notebook directly, but remove the CMD ["ollama","serve"] because this is used to run jupyterhub singleuser here

instead of permanently running ollama, the user can run ollama if needed only