Add checks for link text

The documentation contains links such as [here], [this page], etc. Add a check to the pipeline, so that some common patterns are found.

added CI/CD Pipeline label

assigned to @s2817051--tu-dresden.de

mentioned in commit 47813831

marked this issue as related to #1 (closed)

mentioned in commit 1c5c56ab

closed with commit 47813831

closed with merge request !358 (merged)