Remove links from being ignored when checking external links

Also fix a syntax error in the command

.gitlab-ci.yml

@@ -158,7 +158,7 @@ test:htmlproofer:external_links:
   script:
     - "bundle exec htmlproofer \
         --internal-domains localhost:4000 \
-        --url-ignore '/www.openstoragenetwork.org/,/www.hzdr.de/,/indico4.twgrid.org/,/aai.helmholtz.de/,/cvs.data.kit.edu/',/webfts.fedcloud-tf.fedcloud.eu/' \
+        --url-ignore '/www.openstoragenetwork.org/,/www.hzdr.de/,/indico4.twgrid.org/,/webfts.fedcloud-tf.fedcloud.eu/' \
         --assume-extension public/"
   rules:
     - if: '$CI_PIPELINE_SOURCE == "schedule"'