parse container registries from .nf-core.yml

[mashehu]

Only works in module repos

Also adds a bit more API docs for the different pydantic models

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.33%. Comparing base (b6af91a) to head (0a0cb64).
⚠️ Report is 6 commits behind head on dev.

Files with missing lines	Patch %	Lines
nf_core/modules/lint/main_nf.py	42.85%	4 Missing ⚠️

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