Update volto-slate configuration to indicate it is now part of the core.

[MostafaMagdyy]

Fixes #5342 for volto docs to indicate that volto-slate is now part of the core

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[MostafaMagdyy]

Please review this pull request. @stevepiercy ,@polyester, could you please take a look and provide your feedback? Thank you!

[stevepiercy]

@MostafaMagdyy you have two pull requests open for the same issue (#5884). Neither will be reviewed until you close one. See Item 3 under Things not to do.

[MostafaMagdyy]

@stevepiercy Sorry for inconvenience. I closed the first one because I did not pass the Plone contributor agreement. Now you will find only one regarding this issue

[MostafaMagdyy]

@stevepiercy Thanks for your help regarding prioritizing the important clause. I have committed the suggested changes already. Please check if there are any other changes needed regarding this issue, Also I have reviewed the files within the configuration/volto-slate directory. and found these files focus on extending Volto-Slate into projects that use Volto, with guidance on creating customized plugins. So, I am not sure whether they need to be updated

One thing I noticed that might require updating is this description is

volto-slate API

The volto-slate API provides methods to integrate the Slate editor into projects that use Plone's React-based frontend Volto.

I suggest it to be

The volto-slate API provides methods to extends the Slate editor into projects that use Plone's React-based frontend Volto.

[stevepiercy]

@MostafaMagdyy it is actually an integration, not an extension, so we'll leave it as is.

I also reviewed the rest of the documentation in volto-slate, and it does not need any revisions.

This PR is OK to merge. Thank you!

[stevepiercy]

Actually, I want to make sure that all tests pass. For some reason "Acceptance Tests / Core Blocks - Listing (18.x) (pull_request)" did not pass. I restarted it to see if it is flaky and will pass this time.