docs: refine CONTRIBUTING.md

Signed-off-by: msclock <msclock@qq.com>

.github/CONTRIBUTING.md

@@ -17,6 +17,7 @@ Python on your system, skipping ones that are not installed. You can also run
 specific jobs:
 
 ```console
+$ nox -l   # List available tasks
 $ nox -s lint  # Lint only
 $ nox -s tests  # Python tests
 $ nox -s docs -- serve  # Build and serve the docs
@@ -63,15 +64,29 @@ You can also/alternatively run `pre-commit run` (changes only) or
 Use pytest to run the unit checks:
 
 ```bash
+pip install -e .[test]
 pytest
 ```
 
+or
+
+```bash
+nox -s tests
+```
+
 ## Coverage
 
 Use pytest-cov to generate coverage reports:
 
 ```bash
-pytest --cov=sphinx-deployment
+pip install -e .[test]
+pytest --cov
+```
+
+or
+
+```bash
+nox -s tests -- --cov
 ```
 
 ## Building docs
@@ -88,6 +103,13 @@ You can see a preview with:
 nox -s docs -- serve
 ```
 
+Versioned docs management can be done using:
+
+```bash
+nox -s versioned_docs -- --help # to see options
+nox -s versioned_docs -- serve # to view the versioned docs
+```
+
 ## Pre-commit
 
 This project uses pre-commit for all style checking. While you can run it with