Add slim-trees to community projects (#760)

docs/Community.md

@@ -10,6 +10,7 @@ description: Who is using pixi?
 - [jiaxiyang/cpp_project_guideline](https://github.com/jiaxiyang/cpp_project_guideline): Guide the way beginners make their c++ projects.
 - [karelze/tclf](https://github.com/KarelZe/tclf): A python library for trade classification⚡
 - [quantco/polarify](https://github.com/quantco/polarify): Simplifying conditional Polars Expressions with Python 🐍 🐻‍❄️
+- [quantco/slim-trees](https://github.com/quantco/slim-trees): Pickle your ML models more efficiently for deployment 🚀
 - [hex-inc/vegafusion](https://github.com/hex-inc/vegafusion): Serverside scaling of Vega and Altair visualizations in Rust, Python, WASM, and Java
 - [pablovela5620/arxiv-researcher](https://github.com/pablovela5620/arxiv-researcher): Summarize PDF's and Arixv papers with Langchain and Nougat 🦉
 - [HaoZeke/xtsci-dist](https://github.com/HaoZeke/xtsci-dist): Incremental `scipy` port using `xtensor`