chore(BUX-506): update bux-server config description

[pawellewandowski98]

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Description

• Added description for all config variables

[mergify]

Welcome to our open-source project @pawellewandowski98! 💘

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6f0573e) 39.64% compared to head (d741e9e) 39.64%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #419   +/-   ##
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  Coverage   39.64%   39.64%           
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  Files          47       47           
  Lines        1710     1710           
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  Hits          678      678           
  Misses        992      992           
  Partials       40       40           

Flag	Coverage Δ
unittests	39.64% <ø> (ø)

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[chris-4chain]

Generally - I'm wondering if the underscore-prefixed fields e.g. _beef: with a comment Prefixed with "_", because it's unused by default make sense now. Maybe it would be better to set all fields in config.example and put an appropriate NOTE in the README.