fix missing link target

README.md

@@ -96,6 +96,7 @@ please contact <a href="mailto:bio-it@embl.de">bio-it@embl.de</a>.
 [docs]: https://grp-bio-it.embl.de/docs/
 [embl-gitlab]: https://git.embl.de/
 [embl-homepage]: https://embl.de
+[gitlab-pages-docs]: https://docs.gitlab.com/ee/user/project/pages/
 [jekyll]: https://jekyllrb.com/
 [jekyll-installation]: https://jekyllrb.com/docs/installation/
 [just-the-docs]: https://github.com/pmarsceill/just-the-docs