Help/About: WordPress 5.6 About Page.
This change introduces the new About page for WordPress 5.6.
Props elmastudio, ryelle, melchoyce, karmatosed, webcommsat, marybaum, meher, OGlekler, lmurillom, vimes1984, sabrinazeidan, nalininonstopnewsuk, afshanadiya, michelleames, bmcdede, yvettesonneveld, sarahricker, isabel_brison, helen, hellofromtonya, poena, chanthaboune, cbringmann, joedolson, sabernhardt, garrett-eclipse, audrasjb, marks99.
See #51415.
Built from https://develop.svn.wordpress.org/trunk@49640
git-svn-id: http://core.svn.wordpress.org/trunk@49378 1a063a9b-81f0-0310-95a4-ce76da25c4cd