Simplify SmartEdit setup

Is your feature request related to a problem? Please describe.

https://sap.github.io/spartacus-docs/smartEdit-setup-instructions-for-spartacus/

The current guide warrants an unnecessary change to angular.json and also isn't very clear on data-smartedit-allow-origin

Describe the solution you'd like

• You can streamline it by copying the webApplicationInjector to src/assets, since the whole folder is configured as asset already.

  cp .../hybris/bin/modules/smartedit/smarteditaddon/acceleratoraddon/web/webroot/_ui/shared/common/js/webApplicationInjector.js src/assets
  

• Explain that data-smartedit-allow-origin:

  • allows for multiple whitelist entries, separated by ,
  • supports patterns (* matches a component of a hostname)

  Here is an example configuration that works for local development and the standard endpoints of a ccv2 subscription at the same time:

  <script id="smartedit-injector" src="assets/webApplicationInjector.js" 
      data-smartedit-allow-origin="localhost:9002,*.*.model-t.cc.commerce.ondemand.com:443"></script>
  

Describe alternatives you've considered

Additional context

It's just a minor improvement, but let's make it as easy as possible for everyone.