Update Contribution Page for Jupyter Server

[kjayan]

The following updates are made to the contributing page .

1. During building the docs, errors related to non availability of sphinx can happen. New instructions are added to install this package and its related dependencies
2. Changed format for the line pip install hatch hatch run docs:build to reflect it properly
3. Added double quotes which were missing for some commands like pip install ".[docs]" and pip install ".[test]"

[3coins]

LGTM!

[lresende]

Does the order make a difference here?

[3coins]

Not sure about that, but the CI is generating the same changes, this was what failed the CI in previous commits. @kjayan Would help to check with others in the JupyterLab weekly call, before we merge.

[andrii-i]

• Here's the failed API docs verification run: https://github.com/jupyter-server/jupyter_server/actions/runs/13475837186/job/37672436815
• To reproduce the error locally, checkout commit bbd3be3 (or any other commit before docs update) and run commands from the failed "Build API docs" CI step manually

  jupyter_server/.github/workflows/python-tests.yml

  Lines 65 to 72 in c67a46b

  	- name: Build API docs
  	run: |
  	hatch -v run docs:api
  	# If this fails run `hatch run docs:api` locally
  	# and commit.
  	git status --porcelain
  	git status -s | grep "A" && exit 1
  	git status -s | grep "M" && exit 1

[kjayan]

Tagging @vidartf as discussed in the community call.

[danyeaw]

I reviewed this following the topic coming in to the Jupyter Frontends and Accessibility call. These looks like some great documentation improvements.