Describe the issue
The docs for Hazard only list members of that class, but not of its base classes HazardIO and HazardPlot

To Reproduce
Steps to reproduce the behavior/error:

1. See https://climada-python.readthedocs.io/en/latest/climada/climada.hazard.html#module-climada.hazard.base

Expected behavior
Public methods and attributes of HazardIO and HazardPlot are listed

Climada Version: develop

Additional context: Probably introduced by #871