fix: Made URL to registry relative, fixes #2731

[creativedutchmen]

Instead of having the URL to the registry be absolute (default to 0.0.0.0:8888), use a relative path. This means there's no SSL issues when putting the UI behind a SSL proxy, nor will it try to load it from localhost. This change allows the UI to be deployed to a central location.

Fixes #2731

[adchia]

/lgtm

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.40%. Comparing base (0cf3c92) to head (f114146).
Report is 1080 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2753      +/-   ##
==========================================
- Coverage   80.44%   80.40%   -0.04%     
==========================================
  Files         171      171              
  Lines       14571    14571              
==========================================
- Hits        11721    11716       -5     
- Misses       2850     2855       +5     

Flag	Coverage Δ
integrationtests	70.87% <ø> (-0.33%)	⬇️
unittests	59.02% <ø> (ø)

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