[ ] Footers on Wikimedia wikis: Patch `mediawiki/extensions/WikimediaMessages` in https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikimediaMessages/+/805832
[ ] Sidebar on mw: Create https://www.mediawiki.org/wiki/MediaWiki:mw-developerportal and https://www.mediawiki.org/wiki/MediaWiki:mw-developerportal-url
[ ] Sidebar on mw: Edit https://www.mediawiki.org/wiki/MediaWiki:Sidebar : Add line `mw-developerportal-url|mw-developerportal`; remove lines `mw-bugtracker-url|mw-bugtracker`, `phpdoc-url|phpdoc`, `mw-repo-browse-url|mw-repo-browse`
[ ] Update links and content on https://www.mediawiki.org/wiki/How_to_contribute : It links to https://www.mediawiki.org/wiki/Special:MyLanguage/API:Web_APIs_hub which is meh (see T265017)
[ ] Add/update both links on https://www.mediawiki.org/wiki/How_to_contribute from `link=Special:MyLanguage/Developer hub` to full URL, and from `{{ll|Developer hub|2=<translate><!--T:25--> Software Development</translate>}}` to `[Full_URL <translate><!--T:25--> Software Development</translate>]`
* For https://meta.wikimedia.org/wiki/Wikimedia_Resource_Center/For_developers see instead {T287030}