[TASK] Add Disqus to Detail Template

Add empty TypoScript settings.features.disqusShortname for disqus_shortname
If disqusShortname is set render the Social_DisqusViewHelper in DetailsAction

Resolves: #59816
Change-Id: I3c224d4e60261ac1d4741ec59fed6ab21c78745c
Reviewed-on: https://review.typo3.org/31077
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer