Update contributing guide to use uv instead of poetry

Replaces instructions for installing and using poetry and maturin with uv for dependency management. Simplifies setup steps and updates test instructions accordingly.

Author: baseplate-admin

docs/contributing.md

@@ -14,32 +14,18 @@ My goal for this project is:
 
 Pre-requisite packages:
 
--   Install [poetry](https://python-poetry.org/)
--   Install [pipx](https://pipx.pypa.io/stable/installation/)
--   Install [maturin](https://www.maturin.rs/tutorial)
+-   Install [uv](https://astral.sh/uv)
 
 Then do the modifications to the [lib.rs]{.title-ref} file and add test
 in tests directory.
 
-1.  Install **poetry** dependencies:
+1.  Install **uv** dependencies:
 
     ```sh
-    poetry install
+    uv sync
     ```
 
-2.  Activate **poetry** shell:
-
-    ```sh
-    poetry shell
-    ```
-
-3.  Build with **maturin**:
-
-    ```sh
-    maturin develop
-    ```
-
-4.  Run tests:
+2.  Run tests:
 
     ```sh
     pytest .