Updated contacts (UJ, AS, TH) and contact-at-hifis.net

See here for deployment/review

Added contact-at-hifis.net and 3 names. Note that this Address does not (yet) function - registration ongoing.

Should/can email addresses put in cleartext / clear link (->spamming)? Obfuscation works only with javascript, right? (or recaptcha würg)

Closes #25 (closed)

contact.md

@@ -5,9 +5,14 @@ excerpt:
     Contact to HIFIS Office.
 ---
 
-## Contact us!
+## Questions to this website? Contact us!
 {:.text-success}
 #### Uwe Jandt
-Deutsches Elektronen-Synchrotron (DESY)
+[Deutsches Elektronen-Synchrotron (DESY)](https://www.desy.de/)
+#### Annette Spicker
+[Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)](https://www.helmholtz-berlin.de/)
+#### Tobias Huste
+[Helmholtz-Zentrum Dresden-Rossendorf (HZDR)](https://www.hzdr.de/)
 
-Mail: office-at-hifis.net
+## Mail:
+`contact-at-hifis.net`