(WIP) SatGPT revamp

General UI/UX overhaul.
Implementation of the next generation chat interface for Panel.
Better integration of langchain-based custom tools for the agent.
Testing alternative language models such as llama-2-70b-chat via together.ai/replicate.
Testing new tools for raster data visualization (folium, ipyleaflet, TiTiler).

Llama 2 (image adapted from about.fb.com/news/2023/07/llama-2/)