Update `embedded.png` after running `grunt imagemin`.

After [30059] and [30079] we still had four images which could be minified. Three of them are handled by [30562], the last one by this.

fixes #30141.
Built from https://develop.svn.wordpress.org/trunk@30563


git-svn-id: http://core.svn.wordpress.org/trunk@30552 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: a shorter header on small screens when there is no header text or header image looks more correct.

Props iamtakashi, fixes #30326.



Built from https://develop.svn.wordpress.org/trunk@30564


git-svn-id: http://core.svn.wordpress.org/trunk@30553 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: pinching to zoom in on landscape on iPads is breaking the layout with the sticky sidebar. Providing a one-column view on those screens looks good and will likely prevent other bugs we don't even know about.

Props iamtakashi, fixes #30366.



Built from https://develop.svn.wordpress.org/trunk@30565


git-svn-id: http://core.svn.wordpress.org/trunk@30554 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: prevent too-wide tables from popping out of posts.

Props iamtakashi, fixes #30420


Built from https://develop.svn.wordpress.org/trunk@30566


git-svn-id: http://core.svn.wordpress.org/trunk@30555 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: remove unneeded custom header admin callbacks.

Props philiparthurmoore, fixes #30432.


Built from https://develop.svn.wordpress.org/trunk@30567


git-svn-id: http://core.svn.wordpress.org/trunk@30556 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update Akismet external in trunk to 3.0.3.


git-svn-id: http://core.svn.wordpress.org/trunk@30557 1a063a9b-81f0-0310-95a4-ce76da25c4cd