add e-mail client in Style Guide Parser part in GitHub Actions

[Ira-Maier]

optional: If the automatic Style Guide Parser detects some offenses against the Style Guide rules (https://www.chemotion.net/chemotionsaurus/docs/eln/styleguide_docusaurus) send an e-mail to the author of the commit. Get the e-mail address from git log or git show and search for an e-mail action in https://github.com/marketplace?type=actions.