refactor(html-mappings): add linebreak to html mappings

[ionutpasca]

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[codecov]

Codecov Report

Merging #491 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development     #491   +/-   ##
============================================
  Coverage        76.65%   76.65%           
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  Files              156      156           
  Lines             5525     5525           
  Branches          1228     1228           
============================================
  Hits              4235     4235           
  Misses            1223     1223           
  Partials            67       67           

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[JayaKrishnaNamburu]

Good catch, from the next version of playground we are going to reply mappings directly in th playground. Decoupling from the uidl-resolver.