* New feature/skin option is added and value is read inside
the pageIssues setup code
* issues-group-a class is added to page on server side to remove
the flash of unstyled content
* issues-group-A class is dropped (it's not doing anything!)
* The minerva-issues flag will now accept any value to avoid confusion.
It is used to override the default setting of wgMinervaPageIssuesNewTreatment
A note has been added that this can be removed in future.
Bug: T206179
Change-Id: I3d98fd8f8e1adc818ea03589d2c8f68fe991e861
97fd861a63