In order to remove SkinMinervaBeta, feature flag the categories feature and move the code into MinervaTemplate.php/SkinMinerva.php
- Visit https://en.m.wikipedia.beta.wmflabs.org/wiki/CategoryTest and scroll down the page.
- Make sure you don't see the "Categories" button.
- Opt in to the beta mode and visit the page in step 1.
- Make sure you see the "Categories" button this time.