Revert "keep MWKArticle read on the main thread"
Revert "keep MWKArticle read on the main thread"

This reverts commit b6c4b66d025ee4d064350db6600234330d7142a7.

julienbodet/wikipedia-ios,wikimedia/apps-ios-wikipedia,wikimedia/apps-ios-wikipedia,josve05a/wikipedia-ios,wikimedia/apps-ios-wikipedia,wikimedia/apps-ios-wikipedia,montehurd/apps-ios-wikipedia,josve05a/wikipedia-ios,montehurd/apps-ios-wikipedia,josve05a/wikipedia-ios,montehurd/apps-ios-wikipedia,josve05a/wikipedia-ios,julienbodet/wikipedia-ios,julienbodet/wikipedia-ios,wikimedia/apps-ios-wikipedia,josve05a/wikipedia-ios,wikimedia/apps-ios-wikipedia,josve05a/wikipedia-ios,wikimedia/wikipedia-ios,josve05a/wikipedia-ios,wikimedia/wikipedia-ios,montehurd/apps-ios-wikipedia,montehurd/apps-ios-wikipedia,montehurd/apps-ios-wikipedia,julienbodet/wikipedia-ios,montehurd/apps-ios-wikipedia,montehurd/apps-ios-wikipedia,wikimedia/apps-ios-wikipedia,julienbodet/wikipedia-ios,wikimedia/wikipedia-ios,wikimedia/apps-ios-wikipedia,wikimedia/wikipedia-ios,wikimedia/wikipedia-ios,julienbodet/wikipedia-ios,wikimedia/wikipedia-ios,julienbodet/wikipedia-ios,julienbodet/wikipedia-ios,wikimedia/wikipedia-ios,josve05a/wikipedia-ios