Add audits in the Jupyter ecosystem

[steff456]

This PR,

• [x] Creates a documentation page with the zoom audit
• [x] Creates a documentation page with the keyboard navigation audit
• [x] Creates a documentation section for the audits
• [x] Links the new page for adding it to the side menu
• [x] Links the new section for it to be rendered in the side menu
• [x] Adds reference to other audits that happened in the last 2 years

This PR is part of https://github.com/jupyter/accessibility/issues/125

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:books: Documentation preview :books:: https://jupyter-accessibility--133.org.readthedocs.build/en/133/

[tonyfast]

is there anyway to include other audits that have been done? it seems diminishing of other's efforts to no include them. at the very least, i think it would be working mentioning:

• https://github.com/jupyterlab/jupyterlab/issues/9399
• https://github.com/jupyter/notebook/issues/6800

[steff456]

I'm going to add them in follow up PRs, please see https://github.com/jupyter/accessibility/issues/125

I want to stick with one audit per PR for it to be easier to review

[tonyfast]

thanks for sharing such a thorough roadmap. those improvements look great!

[steff456]

Edit: I pushed the changes for all the audits, so now this PR will add documentation for all the accessibility audits