Add API route config (#1760)

* Add API route config

In addition to requests with Accept header `application/json` return 401 instead of 302 to login page on requests matching API paths regex.

* Update changelog

* Refactor

* Remove unnecessary comment

* Reorder checks

* Lint Api -> API

Co-authored-by: Sebastian Halder <sebastian.halder@boehringer-ingelheim.com>