Remove node-sass dependency

[jhaals]

no longer required.

Fixes #831

[codecov]

Codecov Report

Merging #834 (b1ecdb0) into master (cdefdaf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #834   +/-   ##
=======================================
  Coverage   78.57%   78.57%           
=======================================
  Files           6        6           
  Lines         350      350           
=======================================
  Hits          275      275           
  Misses         49       49           
  Partials       26       26           

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