Introducing the new content & design for the 6.5 About page & related pages. This style is simplified, with no header images, and brings back the illustrations from previous versions for Contribute, Freedoms, and Privacy.
This also includes a fix for heading hierarchy on the Get Involved page.
Props laurlittle, dansoschin, benjamin_zekavica, richtabor, joen, annezazu, swissspidy, marybaum, ryelle, huzaifaalmesbah.
See #60303.
Built from https://develop.svn.wordpress.org/trunk@57715
git-svn-id: http://core.svn.wordpress.org/trunk@57216 1a063a9b-81f0-0310-95a4-ce76da25c4cd
