Add broken/dead links check for markdown

[tapaswenipathak]

Is your feature request related to a OpenMS API Reference Documentation? Please describe.

No, maintenance automation.

• I have attached screenshot describing the problem, if applicable.

Describe the documentation enhancement you'd like

Add automated link/URL check for broken or dead links.

Describe alternatives you've considered

This looks like a good GitHub action: https://github.com/marketplace/actions/markdown-link-check.

Additional context

Would you be interested in adding this GitHub action? @greengypsy

[trickyck]

@tapaswenipathak I'll look into it

[tapaswenipathak]

Closed via #114.