Make checking broken hyperlinks configurable

[ckunki]

See

• Check and report broken hyperlinks #409
• project-keeper.

Proposals

• Maybe create a Nox Task to modify the configuration
• Example in SLC release GH workflow with config file config file

[ArBridgeman]

this is similar in features to #409, which has already been implemented. the benefit of #409's implementation is that it can also be run locally and run from a package we already have in our package's ecosystem.