workflows: update holding pen details page

* Changes syntaxhighlighter to Prism in detailed holding pen view.
* Fixes format display in detailed holding pen view.
bibrank [.py] -> legacy.bibrank
Merge remote-tracking branch 'jalavik-github/workflows-holdingpen-changes' into code-structure-with-webdeposit
webstyle: fixed Makefile

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>