Hygiene: make top-pages script easier to configure
Hygiene: make top-pages script easier to configure

Add some constants and variables.

No functionality changes expected.

Change-Id: I46232f7dfd79c72ab41de479de8f2013446e990d

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