Fix CI broken because of documentation page not listed in the pages configuration
Steps to reproduce
The command "(! grep -rn ' $' etc)" exited with 1.
7.15s$ (cd docs/guides/admin && mkdocs build)
INFO - Cleaning site directory
INFO - Building documentation to directory: /home/travis/build/opencast/opencast/docs/guides/admin/site
WARNING - The page "releasenotes.md" contained a hyperlink to "configuration/logging.and.privacy.md" which is not listed in the "pages" configuration.
Workaround (if any):
That was fixed as part of another PR. I therefore close this issue.