Update docs following the static file service navivagtion and visibility selector changes

[cstns]

Description

Update docs following the static file service navivagtion and visibility selector changes

Related Issue(s)

part of #4419

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.13%. Comparing base (82b5128) to head (b9fc9dd).
Report is 31 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4514   +/-   ##
=======================================
  Coverage   78.13%   78.13%           
=======================================
  Files         296      296           
  Lines       14135    14135           
  Branches     3192     3192           
=======================================
  Hits        11044    11044           
  Misses       3091     3091           

Flag	Coverage Δ
backend	78.13% <ø> (ø)

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