Change Bolt to Bolt for JavaScript

[shaydewael]

Summary

Purely a naming change that affects documentation + README. This changes Bolt language to the more accurate Bolt for JavaScript

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #425 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #425   +/-   ##
======================================
  Coverage    81.5%   81.5%           
======================================
  Files           7       7           
  Lines         530     530           
  Branches      152     152           
======================================
  Hits          432     432           
  Misses         70      70           
  Partials       28      28

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[stevengill]

LGTM