[NFC] Document development dependencies and dependency groups

CONTRIBUTING.md

@@ -35,32 +35,34 @@ into three categories:
 Remember, if you are unsure about anything, don't hesitate to comment on issues
 and ask for clarifications!
 
-## Pre-commit checks
+## Installation of Development Dependencies
 
-Numba-CUDA uses [`pre-commit`](https://pre-commit.com/) to run a number of style
-checks in CI. To ensure your contribution will pass the checks, you can also set
-up pre-commit locally to run the checks prior to committing.
+There are some dependencies that are required for developing Numba-CUDA, but are not required for installation or distribution.
+These dependencies are listed under the `test-cu11` and `test-cu12` optional dependency groups in our project configuration.
 
-To set up pre-commit with Numba-CUDA, run
+To install Numba-CUDA for development, run this in the root of the repository:
 
+```shell
+pip install -e ".[test-cu11]"
 ```
-pip install pre-commit
-```
-
 or
-
-```
-conda install pre-commit
+```sh
+pip install -e ".[test-cu12]"
 ```
 
-depending on your package manager, then run
+Numba-CUDA uses [`pre-commit`](https://pre-commit.com/) to run a number of style
+checks in CI. To ensure your contribution will pass the checks, you can also set
+up pre-commit locally to run the checks prior to committing.
 
-```
+```shell
+# This will run a small set of checks every time you commit.
 pre-commit install
 ```
 
-in the root of the Numba-CUDA repository to set up the pre-commit hooks to run
-checks prior to each commit.
+To run them manually without committing, run this in the root of the repository:
+```shell
+pre-commit run --all-files
+```
 
 ## Releases
 

pyproject.toml

@@ -39,35 +39,23 @@ cu12 = [
     "nvidia-nvjitlink-cu12"
 ]
 test = [
+    "pre-commit",
     "psutil",
     "cffi",
     "pytest",
     "pytest-xdist",
     "filecheck",
 ]
 test-cu11 = [
+    "numba-cuda[cu11]",
     "numba-cuda[test]",
     "nvidia-curand-cu11",
 ]
 test-cu12 = [
+    "numba-cuda[cu12]",
     "numba-cuda[test]",
     "nvidia-curand-cu12",
 ]
-dev = [
-    "pre-commit",
-    "numba-cuda[test]",
-]
-dev-cu11 = [
-    "numba-cuda[test-cu11]",
-    "numba-cuda[test]",
-    "numba-cuda[dev]",
-]
-dev-cu12 = [
-    "numba-cuda[test-cu12]",
-    "numba-cuda[test]",
-    "numba-cuda[dev]",
-]
-
 
 [project.urls]
 Homepage = "https://nvidia.github.io/numba-cuda/"