Remove ack endpoint - fix multiple remove ack

Fix remove ack (#9)

* Removed path prefix for gtg endpoint, logged input params and updated documentation

* Fixed log

* Added more tests

* Moved gtg handler a few lines up in the file to emphasize the fact that it uses the main router

* Decreased timeout value for httpClient

* Added parallel severity check

* Fixed pod severity checking, decreased httpClient timeout

* Fixed tests

* Fixed tests and code format

* Updated readme

* Fixed remove ack endpoint

* Moved cache-control header to services healthcheck handler

* Added all cache control headers

* Removed cache control headers from services health endpoint

* Fixed circle CI