[!!!][TASK] Remove link.action vh from ext:documentation

Remove the doc:link.action view helper in favor of f:be.buttons.icon.

Resolves: #62859
Releases: master
Change-Id: I048966efae366f8ec20d1a6d13c5a65cbc5a3212
Reviewed-on: http://review.typo3.org/33983
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>