Setup a webhook to send events to an external URL for orgs

[deepansh96]

Fixes #{issue id}

Summary

Test Plan

• Test Responsiveness
  • Laptop (1200px)
  • Tablet (760px)
  • Phone (320px)
• Cross-Browser Testing
  • Chrome
  • Firefox
  • Safari (use BrowserStack)
• Local Language Support
• Hygiene and Housekeeping
  • Self-review
  • Comments have been added appropriately
  • Check for bundle size here if adding a package
  • Added relevant details like Labels/Projects/Milestones etc.
  • If adding or removing any environment variable:
    • update docs/ENV.md
    • update Github Workflow files
    • update DockerFile
    • update the secrets for staging and production
• Testing
  • Wrote tests
  • Tested locally
  • Tested on staging
  • Tested on an actual physical phone
  • Tested on production
• Lighthouse Checks
  • Images have alt attributes
  • Any <img> tags have width and height specified
  • Any target="_blank" links have rel="noopener"
  • Only SVGs are used as images. If PNGs are used, their size has been optimised.
  • Any SVGs without text have their aria-label attributes set