Introducing the new content for the 6.9 About page. This release also introduce new header images across the About section.
See #63941.
Props desrosj, jeffpaul, 4thhubbard, priethor, annezazu, fcoveram, joedolson, ryelle, peterwilsoncc.
Built from https://develop.svn.wordpress.org/trunk@61204
git-svn-id: http://core.svn.wordpress.org/trunk@60540 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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