Readers/Structured Data/Chore list

This is an experiment. The team would like to perform regular maintenance on certain processes and tasks (following the lead of Reading/Web/Chore list and Wikimedia Apps/Team/iOS/User feedback review SOP).

For now, each dev will do this one day a week, then report back at a retro

ATM there is only **one chore**. Don't spend anymore than an hour on it, but please do at least think about it a little bit during your chores time:


 * check https://sonarcloud.io/dashboard?id=mediawiki-extensions-WikibaseMediaInfo ... atm (2019-11-27) we have 28 issues (all of which we should fix!), if the number increases then let the team know and we'll prioritize a fix