Feature/#125 update template links

Summary

This MR provides

• updates of the links to template authors
• improved (i.e. linted) Markdown files

Use Cases

As a template author I don't want to be listed as a participant in every single issue opened–which happens when people are referenced with @ instead of a link to their profile.

Documentation

Shall we add your feature to the documentation? There is a feature list available.

Changelog

• I added a statement to the CHANGELOG.

Related Tickets

Closes

#125 (closed)

/cc @mrodzis @mgoebel