Use local imports instead given all relevant files are within the
same repository, and don't vary by configuraion.
Bug: T140807
Depends-On: If3edac9a35b346af0320c12f70c0d978a6346201
Change-Id: Ife3cc345a63aff452e93accbe0a593fbaa358732
$wgResourceLoaderLESSVars is deprecated. Let's not use it anymore.
Change-Id: If28ab6884668700bc46533c8e2c377f17e6be696
Depends-On: Ib9f843147db4473ce5590741e0fb490384b0007e
Bug: T171365