Fix min capacity myopic

[martavp]

Closes #727

Changes proposed in this Pull Request

Fix the minimum capacity set for renewable generators when running the myopic configuration.

I commented out the current code that imposes p_nom_min over p_nom_max.
I think we don't need it anymore, but I'm not sure if I'm missing anything

Checklist

• I tested my contribution locally and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• Changed dependencies are added to envs/environment.yaml.
• Changes in configuration options are added in all of config.default.yaml.
• Changes in configuration options are also documented in doc/configtables/*.csv.
• A release note doc/release_notes.rst is added.