message: Fix wrong link to thomas sauer github
diff: <h2>General Info</h2>
  -<p>This app was initialized by <a href="https://github.com/thomasss" target="_blank">Thomas Sauer</a>
  +<p>This app was initialized by <a href="https://github.com/thomassss" target="_blank">Thomas Sauer</a>
  and brought to a production-ready state by students of the <a href="https://h-da.com" target="_blank">University of
  Applied Science in Darmstadt (h_da)</a>.</p>
  