Improve `@plone/client` documentation

[stevepiercy]

This issue pertains to @plone/cllient. It has several parts that can be worked on in separate pull requests. The affected files are primarily in https://github.com/plone/volto/tree/main/docs/source/client, but might be in other parts of the Volto documentation, too. If you find other places, please add them to this issue.

• Remove any reference to TanStack Query and its terminology, including mutators, useQuery, hooks, and any other of its terms. This task requires that the remaining narrative text is accurate, has correct English grammar, and makes sense to the reader.
• For HTTP API calls, use the lovely sphinxcontrib.httpexample extension, thanks to @datakurre and @Hrittik20's work. This requires a configuration change to the Volto documentation's file docs/source/conf.py, adding it as a dependency to build the docs, and then implement HTTP requests following the examples from sphinxcontrib.httpexample's documentation.
• Forward port the final result to the seven branch.

[iashutoshyadav]

Hi @stevepiercy , I would like to work on this issue. Please assign it to me.

[stevepiercy]

@iashutoshyadav like almost all open source software projects, we don't assign issues. Please read and follow First-time contributors, especially Things not to do, Contributing to Plone, Contributing to Volto, and Contribute to documentation.

[Roshan-Pawar]

@stevepiercy I searched the documentation but couldn't find HTTP examples that need to be converted to sphinxcontrib.httpexample. Could you please point me to the files that should be updated? just trying to understand the project and codebase.