Not sure wheter .RelPermalink or .Permalink should be used and not
really tested, as I don't know where this is used on the website.

src:
https://discourse.gohugo.io/t/why-does-page-url-deprecated-work-while-relpermalink-throws-an-error/35694
https://discourse.gohugo.io/t/why-does-page-url-deprecated-work-while-relpermalink-throws-an-error/35694

This reverts commit 7868577c.

* white space between names and keys
* added tv2 keys and board 21/22 keys
* empty board key files are ignored now
* fixed description for board keys
* added Freimann to Studentstadt in Impressum

* Fingerprint: new front matter variable to define fingerprints for both
personal and member keys
* Redirects: Added redirects for empty folger pages such as
/de/keys/board

* list of all board keys sorted by date, downloadable
* optional keys from board members which are shown and downloadable if
* before expiery date
* if the exists
* if they file has content i.e. includes a key