This commit syncs minor changes for the default theme from its active development repository to core.
This is a follow up to [52081], [52107], [52164], [52222], and [52283]. It reduces the size of a video asset, renames the templates and template parts directories, and adds CSS for button hover states. To view the full set of changes, visit 1a121e0224...da994d1fe5.
Props kjellr, mburridge, sabernhardt, hellofromtonya, scruffian.
See #54318.
Built from https://develop.svn.wordpress.org/trunk@52335
git-svn-id: http://core.svn.wordpress.org/trunk@51927 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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