Steps to replicate the issue (include links if applicable):

Right now when I search on codesearch, I see results for archived extensions
e.g. https://codesearch.wmcloud.org/search/?q=Provide%20original%20MediaWiki%20skins%20with%20advertising%20possibilities&i=nope&files=&excludeFiles=&repos=
shows the archived https://github.com/WikiMANNia/MediaWiki-Skins-with-Advertisements

This makes it difficult to handle deprecations as part of the code stable policy as the code is frozen on an older version of MediaWiki

Are we able to detect archived repos and treat them differently in Codesearch?

What should have happened instead?:

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):