feat(ui): UI updates (Theming support, action fix)

[jkowalski]

• theming support feat(ui): Added theming support htmlui#150
• actions fix fix(actions): actions are not saved after sanitizeActions() htmlui#163

Thanks @lupusA

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.05 ⚠️

Comparison is base (537ab39) 75.41% compared to head (c72f3cc) 75.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3145      +/-   ##
==========================================
- Coverage   75.41%   75.37%   -0.05%     
==========================================
  Files         459      459              
  Lines       36318    36341      +23     
==========================================
+ Hits        27389    27391       +2     
- Misses       7022     7032      +10     
- Partials     1907     1918      +11     

Impacted Files	Coverage Δ
internal/server/server.go	73.69% <100.00%> (-0.39%)	⬇️

... and 12 files with indirect coverage changes

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[lupusA]

Looks good to me.
Thanks.