change relative URL for Impressum

_includes/footer.html

@@ -4,7 +4,7 @@
     © Copyright {{ site.time | date: '%Y' }} {{ site.first_name }} {{ site.middle_name }} {{ site.last_name }}.
     {{ site.footer_text }}
     {% if site.impressum_path %}
-    <a href="{{ site.url }}{{ site.baseurl }}{{ site.impressum_path }}">Impressum</a>.
+    <a href="{{ site.impressum_path | relative_url }}">Impressum</a>.
     {% endif %}
     {% if site.last_updated %}
     Last updated: {{ "now" | date: '%B %d, %Y' }}.
@@ -17,7 +17,7 @@
     &copy; Copyright {{ site.time | date: '%Y' }} {{ site.first_name }} {{ site.middle_name }} {{ site.last_name }}.
     {{ site.footer_text }}
     {% if site.impressum_path %}
-    <a href="{{ site.url }}{{ site.baseurl }}{{ site.impressum_path }}">Impressum</a>.
+    <a href="{{ site.impressum_path | relative_url }}">Impressum</a>.
     {% endif %}
     {% if site.last_updated %}
     Last updated: {{ "now" | date: '%B %d, %Y' }}.