Add flatpage URL for /issues/

Jira has been decommissioned and replaced with a flatpage

gnuviechadmin/gnuviechadmin/urls.py

@@ -38,6 +38,7 @@ urlpatterns = [
     path("contact/", include("contact_form.urls")),
     path("impressum/", views.flatpage, {"url": "/impressum/"}, name="imprint"),
     path("datenschutz/", views.flatpage, {"url": "/datenschutz/"}, name="privacy"),
+    path("issues/", views.flatpage, {"url": "/issues/"}, name="support"),
 ]
 
 # Uncomment the next line to serve media files in dev.