v15.3.0

feat: add userinfo route (#80)

* Factor cookie extraction out for use elsewhere

* Remove dead code

* Remove dead code

* Refactor constants onto app context

* Add userinfo route

* Improved logging of health check failure

* Bugfix

* Tests. Version.

* Route handler test

* Use jsonwebtoken instead of jwt-decode

* Return userinfo from login route

* Set Path correctly when clearing token cookie on logout