We suspect we'll need this feature for importing and migrating wikis and it will also make the process of updating wikis more assured.

A possible implementation of this is adding a flag to wiki entities in the platofrm api and then exposing this using https://github.com/wbstack/api/blob/main/app/Http/Controllers/WikiSettingController.php. This could then be acted upon by tweaks to the mediawiki images

See: https://www.mediawiki.org/wiki/Manual:$wgReadOnly

Acceptance Criteria:

• It should be possible, via the platform to place wikis into readonly mode
• it should be possible both on wikibase.dev, wikibase.cloud, but also on wbstack.com since we'll need this for the migration