[TASK] Use buttons in Install tool

All buttons in the install tool cards footer do now
use proper button tags instead of anchor tags with
an empty target.

Also the mark/umark buttons in "upgrade docs" do
now use proper button tags.

Resolves: #93347
Releases: master
Change-Id: I4c079b56808b8167b0ddf30392d9cfb0ce36caf0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67505


Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>