adding skip-web-assets alias to skip-static

[Himavanth]

Description

Fixes #312

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #358 (36bd189) into master (4f19c74) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #358   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           30        30           
  Lines         1331      1331           
  Branches       219       219           
=========================================
  Hits          1331      1331           

Impacted Files	Coverage Δ
src/commands/app/build.js	100.00% <100.00%> (ø)
src/commands/app/deploy.js	100.00% <100.00%> (ø)
src/commands/app/undeploy.js	100.00% <100.00%> (ø)

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[moritzraho]

lgtm !