Custom CKEditor config no longer working with version in Craft CMS #749
Description
Describe the issue
The custom config previously added for CKEditor no longer works since Craft now uses CKEditor v5. This means that certain functionality previously available via the WYSIWYG editor toolbar in Craft has vanished (e.g. button classes for links, floating of images, the "clean-list" class for unordered lists), and on the front end we no longer have our responsive table markup.
To reproduce
Here is an example page with a table that is no longer responsive and so causes unwanted horizontal page scrolling on smaller screen sizes: https://www.w3.org/standards/types/
Expected behavior
The expected behaviour of responsive tables is documented in the W3C Design System: https://design-system.w3.org/styles/tables.html#responsive-tables
Screenshots
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Additional context
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