Related to/requires wikitext from: https://phabricator.wikimedia.org/T352188
Task: there's default wikitext for a Main Page that get's used for new wikibases.
There exists a proof of concept PR here: https://github.com/wbstack/mediawiki/pull/404/
It currently has the wikitext hardcoded in a variable. In case the source code is the right place for this to live, we should replace it with an agreed upon copy and store it somewhere slightly tidier, for example an autoloaded class constant.
Current implementation assumptions/limitations:
- Every new wikibase gets the same default page
- It's okay that if we change the text template, existing pages will not adjust to updated text versions
- The text template does not change very often and requires engineers to change/deploy it
ACs:
- [ ] The wikitext from T352188 gets used per default as the Main Page for new wikibases