We have a proposal for a mediawiki.org homepage at https://www.mediawiki.org/wiki/MediaWiki/Homepage_redesign
We should push it for community review and approval, introducing improvements if needed.
There was also a declined RfC in 2012 at https://www.mediawiki.org/wiki/Requests_for_comment/MediaWiki.org_Main_Page_tweaks (and see its talk page)
Relevant technical items: