Advertise webui on mdns

[yuzawa-san]

• conditionally advertise the webui
• discoverable via (on a mac) dns-sd -Z _http._tcp

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.64%. Comparing base (8547551) to head (4c45d71).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #519      +/-   ##
=============================================
+ Coverage      85.47%   85.64%   +0.17%     
- Complexity        78       80       +2     
=============================================
  Files             10       10              
  Lines            420      425       +5     
  Branches          52       52              
=============================================
+ Hits             359      364       +5     
  Misses            38       38              
  Partials          23       23              

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