Merge branch 'Imprint-link-to-DESY' into 'master'

Imprint link + Privacy link to DESY

See merge request hifis/hifis.net!60

_data/navigation.yml

@@ -40,7 +40,7 @@ footer:
            url: faq
            
          - title: Imprint
-           url: imprint.html
+           url: "https://www.desy.de/imprint"
 
          - title: Privacy
-           url: privacy.html
+           url: "https://www.desy.de/data_privacy_policy"

_includes/footer.html

@@ -22,7 +22,7 @@
             </a>
 
             {% for entry in site.data.navigation.footer %}
-                <a href="{{ base_url }}{{ entry.url }}" class="btn btn-primary">
+                <a href="{{ entry.url | relative_url }}" class="btn btn-primary">
                     {{ entry.title }}
                 </a>
             {% endfor %}