use template module, expose add and delete command

[moritzraho]

Description

This PR

• Integrates with https://github.com/adobe/generator-aio-app
• implements an add/delete command

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 #113 into master will increase coverage by 2.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
+ Coverage   89.07%   91.09%   +2.01%     
==========================================
  Files          11       15       +4     
  Lines         293      348      +55     
  Branches       39       36       -3     
==========================================
+ Hits          261      317      +56     
+ Misses         28       27       -1     
  Partials        4        4

Impacted Files	Coverage Δ
src/commands/app/delete/web-assets.js	100% <100%> (ø)
src/commands/app/undeploy.js	100% <100%> (ø)	⬆️
src/commands/app/add/web-assets.js	100% <100%> (ø)
src/commands/app/deploy.js	92.59% <100%> (ø)	⬆️
src/commands/app/add/action.js	100% <100%> (ø)
src/commands/app/create.js	100% <100%> (ø)	⬆️
src/commands/app/delete/action.js	100% <100%> (ø)
src/commands/app/init.js	100% <100%> (+3.03%)	⬆️
src/commands/app/add/auth.js	100% <100%> (ø)
... and 3 more

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[moritzraho]

@purplecabbage this is ready to review! 🙂