Streamlining collection creation and notifications

[bishwaspraveen]

Description

Emily adds new collections to the webapp directly with all requisite metadata. Li needs to be notified automatically whenever Emily does this. Add a slack notification for every new collection that she creates.

Implementation snapshots

• Created 3 test collections.
  
• Received 3 notifications for all the new collections created along with the names of the collections.

Considerations

I've created a webhook url for Li's slack. However, we do not want this to be on the repo. So make sure to set the env variable on AWS as follows :
XLI_SLACK_WEBHOOK_URL = "https://hooks.slack.com/services/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"