Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  78c4c935740fddf6b5558fa1f380a50dd37a0353

Cleanup mf-common.less

Remove undocumented css (should be put in Mobile.css if a problem)
Move main page specific css to mainpage.css

Change-Id: Ic296baebaed1aa457374a44aa24335c2f40821dd