api: unexport cloneRepository handler

Related to #289.
api: unexport apiIsAvailable handler

Related to #289.
api: unexport appList handler

Related to #289.
api: unexport appInfo handler

Related to #289.
api: unexport createApp handler

Related to #289.
api: rename function

You can infer the "OrError" suffix from the multiple return values.
api: unexport addUnits handler

Related to #289.
api: unexport removeUnits handler

Related to #289.