docs: add section on third-party monitoring tool arq-ui

[antonko]

No description provided.

[codecov]

Codecov Report

Merging #442 (903178f) into main (94cd878) will increase coverage by 0.19%.
Report is 10 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #442      +/-   ##
==========================================
+ Coverage   96.27%   96.47%   +0.19%     
==========================================
  Files          11       11              
  Lines        1074     1078       +4     
  Branches      209      190      -19     
==========================================
+ Hits         1034     1040       +6     
  Misses         19       19              
+ Partials       21       19       -2     

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