Onboarding and Documentation Refresh

[toastercup]

Purpose Currently, there's no obvious way for a new user to setup Cortex on their own. This PR chips away at and mostly solves that problem.

JIRA N/A

Changes

• Improvements and fixes

  • Fleshes out and refactors bin scripts for engine and dummy spec app
  • Downsizes Readme and updates it to refer to documentation portal
  • Sets up npm package for distribution
  • Updates Contribution Guide
  • Updates CKEditor

• Changes to developer setup/environment

  • bin scripts are now preferred over manual commands

• Architectural changes

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• Migrations or Steps to Take on Production

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• Library changes

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• Side effects

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Screenshots

• Before N/A

• After N/A

Feature Server N/A

How to Verify These Changes

• Specific pages to visit

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• Steps to take

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• Responsive considerations

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Relevant PRs/Dependencies

• https://github.com/cortex-cms/cortex-starter/pull/2

Additional Information N/A