chore(docs): update code snippets to use krakenjs scope

[gregjopa]

This PR updates the README to use the new krakenjs npm scope.

[codecov-commenter]

Codecov Report

Merging #29 (f5c52fd) into main (c21fe35) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #29   +/-   ##
=======================================
  Coverage   72.90%   72.90%           
=======================================
  Files          11       11           
  Lines         310      310           
  Branches       16       16           
=======================================
  Hits          226      226           
  Misses         83       83           
  Partials        1        1           

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