Update settings for ram air kite model and make some sections non-obligatory

[1-Bart-1]

closes #76

• Adds tests for settings_ram.yaml
• Removes outdated 3l model

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.09%. Comparing base (d792f14) to head (ced86c7).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/settings.jl	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   85.20%   84.09%   -1.12%     
==========================================
  Files          14       14              
  Lines         987      918      -69     
==========================================
- Hits          841      772      -69     
  Misses        146      146              

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[ufechner7]

Please answer the inline questions.

[ufechner7]

One issue to address.