Revert to previous commit (Attempt #2) (microsoft#1285)

* Add dox42 Custom Connector to certified-connectors folder

* Change description of the dox42 Connectorf
Make slight adjustment in the README.md

* Change Host URL to more generic URL

* Make some parameters mandatory to prevent potential errors

Co-authored-by: Diego Schleis <dox42diegoschleis>

Author: dox42diegoschleis