Updated email to an HTML page when deployment is successfull

.github/workflows/build-production-deploy-s3.yml

@@ -39,5 +39,5 @@ jobs:
 
       - name: Send Email on Success
         if: success()
-        run: curl --request POST --url https://api.sendgrid.com/v3/mail/send --header  "Authorization:Bearer ${{ secrets.SENDGRID_API_KEY }}" --header "Content-Type:application/json" --data '{"personalizations":[{"to":[{"email":"${{ secrets.SENDGRID_TO_EMAIL }}"}],"subject":"Footlight CMS Deployment"}],"from":{"email":"${{ secrets.SENDGRID_FROM_EMAIL }}"},"content":[{"type":"text/plain","value":"A new version of Footlight CMS has been deployed."}]}'
+        run: curl --request POST --url https://api.sendgrid.com/v3/mail/send --header  "Authorization:Bearer ${{ secrets.SENDGRID_API_KEY }}" --header "Content-Type:application/json" --data '{"personalizations":[{"to":[{"email":"${{ secrets.SENDGRID_TO_EMAIL }}"}],"subject":"Footlight CMS Deployment"}],"from":{"email":"${{ secrets.SENDGRID_FROM_EMAIL }}"},"content":[{"type":"text/html","value":"${{ vars.NEW_RELEASE_HTML_PAGE }}"}]}'