fix: update paths and include linux esbuild

[ssvegaraju]

Issue #, if available:

Description of changes:
Updating paths to use forward slashes instead of backslashes as per https://stackoverflow.com/a/38428899. In addition, created a .yarnrc.yml to allow for multiple versions of esbuild based on platform.

Tested using WSL.

Checklist:

• Have you successfully deployed to an AWS account with your changes?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #656 (ab29c56) into develop (d6d3e00) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #656   +/-   ##
========================================
  Coverage    95.65%   95.65%           
========================================
  Files            4        4           
  Lines          207      207           
  Branches        30       30           
========================================
  Hits           198      198           
  Misses           9        9           

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