Hygiene: remove extracts.js
Hygiene: remove extracts.js

Follow-up of Idc70d6e989a67421ee5af1b0d2350cfc06a3da94.
Should have removed that then.

Change-Id: I35ee543be4c9ae6d14857fefc1ef42b64f18fa34

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps