[TASK] Remove obsolete TypoScript initialization code

Since meanwhile merged to the TypoScript core, the removed lines are
not longer necessary.
[BUGFIX] Fixed nesting error in template

Fixes an error where f:if and f:then was not correctly closed.
Besides, an additional nesting unattractivity is fixed and
an in-line comment has been added.
[TASK] Removed composer requirements

Removed requirements of TYPO3.Asset and less.php since
this is more a distribution responsibility.