Remove Attributes + classes show no description

[Gabriel-p]

My documentation can be found here https://asteca.readthedocs.io/en/latest/autoapi/asteca/index.html

I have two issues:

1. I'd like to remove the 'Attributes' section entirely as it is just duplicated info from 'Submodules'
2. Classes descriptions randomly do not show (some builds it will, some it won't)

Can this be done? Thank you!