Merge branch 'update-job-offers' into 'master'

Update job offers

See merge request hifis/hifis.net!151

_data/navigation.yml

@@ -29,8 +29,8 @@ header:
         - title: Team
           url: "team.html"
 
-        - title: Job Offers <i class="fas fa-bell"></i>
-          url: "job_offers.html"
+        - title: Job Offers
+          url: "https://www.helmholtz.de/en/jobs_talent/job_vacancies/"
 
 footer:
          - title: Contact