Background
In T234807: Determine impact of $wgMFNoindexPages search traffic to arwiki, zhwiki, hiwiki, itwiki, nlwiki, kowiki we measured the impact of adding alternate tags for mobile versions of the page for a set of wikis so that the site can be indexed properly. There results were that we did not see any negative effects to pageviews. This task is to turn on the alternate tags for all pages
Acceptance criteria
- add link rel="alternate" to all projects (as in T234807: Determine impact of $wgMFNoindexPages search traffic to arwiki, zhwiki, hiwiki, itwiki, nlwiki, kowiki)