index.md Indices and tables not build properly

After html rendering: (https://hereon-netcdf.readthedocs.io/en/latest/index.html)

1. Index and Search Page are empty
2. Module Index == 404

code: https://codebase.helmholtz.cloud/hcdc/hereon-netcdf/hereon-netcdf-en/-/blob/main/source/index.rst?ref_type=heads&plain=1#L68

Indices and tables
==================

* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`