Update theme-compat header and footer #128

Job	Run time
Core running from src / Linux	2m 30s
Core running from build / Linux	2m 36s
Gutenberg running from ${{ matrix.directory }}	0s
Gutenberg running from ${{ matrix.directory }}	0s
Core running from ${{ matrix.directory }}	0s
Slack Notifications	-1s
Failed workflow tasks	-1s
	5m 4s

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