Small documentation issues (plots not showing up/not clear)

[dbrakenhoff]

Describe the task

• Geotop notebook: Last plot under aggregate-voxels-to-regis-layers in geotop notebook is not really visible. Fix figure dimensions. https://nlmod.readthedocs.io/en/stable/data_sources/15_geotop.html#aggregate-voxels-to-regis-layers
• KNMI data noteboo: Plot not showing up, but some weird path to a png: https://nlmod.readthedocs.io/en/stable/data_sources/21_meteorological_data.html#seperate-the-meteorological-measurement-values-and-the-station-locations

EDIT: first one is intentional for faster docs, so do not fix.

[rubencalje]

The plot in the GeoTOP-notebook looks a bit weird as I have decreased the y-range of the model extent, so the notebook runs faster for the generation of the documentation. So this is intentional (if that was what you mean).

[dbrakenhoff]

Yea, that's what I meant. Not so important but just looked a bit weird, but fine to keep it this way 👍