We discussed whether the minor-version is relevant for the API base-path and came to the conclusion, that it's not really needed as breaking API changes need a new major version anyway.
This commit also removes the trailing slash from the URL which is returned by `getBackendUrl`. This is needed as we composed the API routes in our implementation always with a starting slash thus leading to double slashes.
Example of old behaviour:
getBackendUrl() + '/config'
=> example.com/api/v2.0//config
Example of new behaviuor:
getBackendUrl() + '/config'
=> example.com/api/v2/config
