SMUI major update v4: New configuration and defaults

[pbartusch]

1. Set smui.target-environment.config (currently on the preview_link branch) to:

"""{
  "LIVE": {
    "en": [
      {
          "rulesCollection": "AmazonEN",
          "tenantTag": null,
          "previewUrlTemplate": "https://www.amazon.com/s?k=$QUERY"
      }
    ]
  }
}"""

This way:

• SMUI quickstart showcases the preview link functionality.
• SMUI production setups (e.g. querqy/chorus or custom installations) are able to explicitly define the target environment.

[pbartusch]

Created a querqy-docs branch to document changes towards this new SMUI major that we can use together:

https://github.com/querqy/querqy-docs/tree/towards_new_smui_major