[BUGFIX] Add record filter to ListByCategory and OverviewWithoutCategories view for ScrollBrowser JS to work

[TASK] Discard ScrollBrowser Filtering and add hint that pagination can break to newsByCategory plugin

Beforehand all category headers were shown first, then all article teasers. Now the teasers are divided into categories.

See https://developers.google.com/search/docs/guides/mark-up-listings#summary-page--multiple-full-details-pages for better understanding.

flexform config for all plugins