fix(vue): show how to use Vue Component in a Formatter

[ghiscoding]

• also delete unused VueUtilService that we never actually used since it's easy enough with createApp()
• update Formatter docs to show how to use Vue Component via a Custom Formatter

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.5%. Comparing base (0351a18) to head (4be034a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1817   +/-   ##
======================================
  Coverage    99.5%   99.5%           
======================================
  Files         187     187           
  Lines       34442   34442           
  Branches    10191   10191           
======================================
  Hits        34259   34259           
  Misses        183     183           

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