Enable the solution plugin for DMs

[rokejulianlockhart]

This was meant to be successor to:

KDE Phabricator maintenance (phorge.it?)

https://discuss.kde.org/t/enable-the-solved-plugin-on-all-categories-or-allow-setting-help-as-a-tag/1229?u=rokejulianlockhart

However, it’s 404 for me.