Sometimes productive users are unproductive in a certain area of a wiki. Rather than entirely block them, the software can allow for users to be blocked from editing pages within a specific category.
Example; User:Giraffe is a highly productive contributors but has an agenda against Climate Change and regularly disrupts pages with [[https://en.wikipedia.org/wiki/Category:Climate_change|Category:Climate change]]. If they were prevented from editing all pages within this category their future disruption could be prevented and their constructive edits could continue.
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====Acceptance criteria
* After {T2674}:
* If an admin specifies a page or category to block:
** Page blocks can only be set for existing pages/categories only, with validation required in the input field.
** An autosuggest should help the user find the correct page.
** Pages can be from any namespace
** If a page or category is moved, the user should still be blocked from editing (e.g. block by page ID, not page name)
* If a category is provided, the blocked user cannot edit either the category page itself and all pages within the category.