[#800] docs: headless mode

[yottahmd]

Resolves #800

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.55%. Comparing base (4766a18) to head (0783f5e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #806      +/-   ##
==========================================
+ Coverage   55.53%   55.55%   +0.02%     
==========================================
  Files          73       73              
  Lines        7908     7905       -3     
==========================================
  Hits         4392     4392              
+ Misses       3136     3134       -2     
+ Partials      380      379       -1     

Files with missing lines	Coverage Δ
internal/config/config.go	69.79% <ø> (+2.11%)	⬆️
internal/config/loader.go	81.44% <100.00%> (ø)

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