Add text format with CKeditor

[stephen-cox]

At the moment there's only plaintext editing. People will want to use CKEditor.

What buttons do we want to include by default? Do we want to include an optional dependency to localgov_media with an entity browser for inserting media as part of this issue?

[stephen-cox]

@ekes @finnlewis Just looking at implementing a CKEditor text format. It's not immediately obvious where it should live. If we put it in core then it will be enabled for any site that uses a localgov component, given they will already have their own text formats this is desirable. Other options are to create a module specifically for this, which seems overkill to me, or to add it to media, which is not necessarily the most obvious place.

Any thoughts? My inclination is to add this to media as it will simplify things when adding a media browser button to CKEditor.

Another question is what buttons we want in CKEditor, my thinking is to add a bunch of defaults taken largely from what Croydon do and then we can review.

[stephen-cox]

A quick review of other distributions show that there are a number of different ways:

• Lightning - in the media module: https://git.drupalcode.org/project/lightning_media/-/tree/8.x-3.x/config/install
• Thunder - in the profile: https://git.drupalcode.org/project/thunder/-/tree/8.x-3.x/config/install
• Open Social - in its own module: https://git.drupalcode.org/project/social/-/tree/8.x-9.x/modules/social_features/social_editor/config/install
• Varbase - in its own module: https://git.drupalcode.org/project/varbase_editor/-/tree/8.x-7.x/config/optional
• deGov - in its own module: https://git.drupalcode.org/project/degov/-/tree/release/8.2.x/modules/degov_rich_text_format_settings/config/install

[stephen-cox]

From our discussions at standup I will add this to the media module for now as it will be easy enough to move to it's own module later on.