doc: Add documentation reflecting new CLI

[cadenmyers13]

closes #192

I also made it so that when a wavelength isnt specified and a wavelength cannot be found, it returns a value error instead of printing the message. This makes the behavior much cleaner and doesn't allow for things to slip pass

[cadenmyers13]

We need this because I think in the latest skpkg, the CLI prints in color and Gooey cannot handle this nicely, the ANSI sequence shows up in the panel.

[cadenmyers13]

@sbillinge ready for review

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.13%. Comparing base (6a632b7) to head (be60e61).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/test_tools.py	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #215      +/-   ##
==========================================
- Coverage   99.37%   99.13%   -0.25%     
==========================================
  Files           5        5              
  Lines         322      345      +23     
==========================================
+ Hits          320      342      +22     
- Misses          2        3       +1     

Files with missing lines	Coverage Δ
tests/test_tools.py	98.67% <95.65%> (-0.35%)	⬇️

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