Add information to first PR position at HZDR

• Also make the link to the jobs page available on hifis.net again

job_offers.md

@@ -10,12 +10,14 @@ excerpt:
 {:.text-success}
 
 * Helmholtz-Zentrum Dresden - Rossendorf (HZDR):  
-  [**Referent (w/m/d) Öffentlichkeitsarbeit HIFIS**](https://www.hzdr.de/db/Cms?pNid=490&pOid=63825&pContLang=de)  
+  [<i class="fas fa-external-link-alt"></i> **Referent (w/m/d) Öffentlichkeitsarbeit HIFIS**](https://www.hzdr.de/db/Cms?pNid=490&pOid=63825&pContLang=de)  
 
   > Take advantage of the broad scope for action and design and advance
   > the external appearance of HIFIS with your own ideas together with us.
 
-  Application deadline: August 30, 2021. 
+  **Application deadline:&& August 30, 2021.
+
+---
 
 # Further offers