Add Category for pages

In the project I'm working on, there is a requirement for multiple CMS pages, grouped by different criteria.
For example, we have a page listing the diagnostics offered and pages with descriptions of the diagnostics themselves, which in turn are grouped products.
To make this possible, we use BitBagSyliusCmsPlugin with many improvements.
I think that if the following additional structures are made:
Category -> Article, this will lead to much better performance of this plugin.
This makes it possible to create a FAQ page, Consent and many other interesting features.

It might be a good idea to take a look at what Monsieur Biz offers for a content builder - SyliusRichEditorPlugin, but the integration with the current builder is also elementary, just add custom element and form type.

We also currently need EditorJS integration for forms, I think this would be a much better solution than the current limited Trix.

The issue names no files, tests, or entry points. Start by reviewing the current CMS page and article structures and the existing builder integration, then compare the proposed Category → Article relationship with the EditorJS integration request. Done would require a defined, agreed scope and an implemented category-based content structure, but the issue does not establish acceptance criteria.