Pimps the Playground with examples

[adrienpoly]

• replace parcel with webpack-dev-server
• adds yarn start:playground script
• adds new examples

[codecov[bot]]

Codecov Report

Merging #44 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #44   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines          69     69           
=====================================
  Hits           69     69

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