* Optionally restrict discord authentication to members of a specific server

* fix: discord auth module code linting
Co-authored-by: Lucas Neves <lneves@modusgames.com>
Co-authored-by: Nicolas Giard <github@ngpixel.com>

* added custom keycloak authentication.

* update readme.

* updated readme.

* reverted README for PR.

* fix: use async/await

* changed callback parameter name from done to cb.

* fix: keycloak description + website

* fix: keycloak logo

* updating a switch into object literal and fixed a couple linter errors

* added a comment about weird formatting

* style: use lodash get

* fix: pass eslint + puglint + jest