Remove depends section from schemas

[dalonsoa]

Description

Remove the depend section from all the schemas, which was a leftover from the previous approach and that is no longer relevant after implementing the variables system in full. The documentation is updated accordingly.

Fixes #660

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works
• Relevant documentation reviewed and updated

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.60%. Comparing base (7838fa8) to head (d2868c0).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #694   +/-   ##
========================================
  Coverage    94.60%   94.60%           
========================================
  Files           73       73           
  Lines         4800     4800           
========================================
  Hits          4541     4541           
  Misses         259      259           

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[vgro]

LGTM

[sallymatson]

LGTM !