Feature: Add right/left n/p keyboard navigation to all Python docs

Describe the enhancement or feature you would like

Right now the accessibility audit https://github.com/python/devguide/issues/1792 is blocking keyboard navigation https://github.com/python/devguide/pull/1784 not only for devguide, but across Python ecosysem https://github.com/orgs/sphinx-doc/discussions/14406 https://github.com/sphinx-doc/sphinx/pull/14408 https://github.com/readthedocs/sphinx_rtd_theme/pull/1686 https://github.com/pradyunsg/furo/discussions/932

Clearly, other projects may not have the resources to access the risk of hurting sensitive auditory, so all maintainers just don't take it - and while Sphinx comes with keyboard shortcuts, no project across Pyto ecosystem enables it.

Now that there is a chance to do accessibility study, please make sure that both arrow keys and vim `style n/p keys are evaluated for usage, with official "documentation accessibility" chapter, that could be easily referenced for other projects to follow.

Thanks for your time, folks.

Describe alternatives you have considered

No response

Additional context

No response

首先审阅链接的无障碍审计、devguide 导航拉取请求以及 Sphinx 生态系统中的讨论，以了解其中指出的风险和现有方法。确定官方文档无障碍章节的范围，以及应如何在各个 Python 文档项目中评估箭头键导航和 vim 风格的 n/p 导航；完成后应提供其他维护者可以参考的指导。