[TASK] Move PageRenderer default html template

Moves the default html backend template for PageRenderer
to the corresponding extension EXT: core.

Change-Id: Icc69207bd74de4bc1bc0a7a7be4f8d9aceb0ed80
Fixes: #47892
Releases: 6.2
Reviewed-on: https://review.typo3.org/20471
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn