Remove deprecated build examples without a config file

[hboisgon]

HydroMT-Wflow version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Kind of issue

Docs are wrong

Location of the documentation

example for build wflow:
https://deltares.github.io/hydromt_wflow/latest/_examples/build_model.html

Documentation problem

Building a model without a config file is not really expected behavior anymore and is now not working properly

Suggested fix for documentation

Remove this part of the examples