Improve Khoj First Run, Docker Setup and Documentation

[debanjum]

Improve

• Intelligently initialize a decent default set of chat model options
• Create non-interactive mode. Auto set default server configuration on first run via Docker

Fix

• Make RapidOCR dependency optional as flaky requirements
• Set default openai text to image model correctly during initialization

Details

Improve initialization flow during first run to remove need to configure Khoj:

• Set Google, Anthropic Chat models too Previously only Offline, Openai chat models could be set during init

• Add multiple chat models for each LLM provider Interactively set a comma separated list of models for each provider

• Auto add default chat models for each provider in non-interactive model if the {OPENAI,GEMINI,ANTHROPIC}_API_KEY env var is set

  • Used when server run via Docker as user input cannot be processed to configure server during first run

• Do not ask for max_tokens, tokenizer for offline models during initialization. Use better defaults inferred in code instead

• Explicitly set default chat model to use If unset, it implicitly defaults to using the first chat model. Make it explicit to reduce this confusion

Resolves #882

[sabaimran]

Awesome getting some of this setup path cleaned, documentation improved, and default case made easier 🎉