Dir-assistant

- Added support for models that include a `<thinking></thinking>` block in their response.
- Added an example script for analyzing stock sentiment on reddit.

Improved Windows support

* Added `llama-cpp-python` as an optional instead of required dependency downloadable
with `pip install dir-assistant[recommended]`
* Official Windows support
* Custom API server connections using the new LiteLLM completion settings config section. This enables
you to use your own GPU rig with `dir-assistant`.

- Reverted untested default embed chunk size

- Switched default API LLM from gemini 1.5 flash to gemini 2.0 flash

- Automatically override configs by using matching environment variables
- Run a single prompt and quit with the new -s CLI option
- Persistent prompt history across sessions