* Add functionality to resend an aged alert to alertmanager when a user clicks close
* Add the code to allow OpsGenie to update Alerta
* Fix config example in README.md
* No need for backticks
* Update the OpsGenie screenshot
* Fix some links in README.md
* Fix up some of the links to OpsGenie docs
* Add a known configurable source: value to the payload from the OpsGenie plugin
* Add some troubleshooting around alert source usage
Co-authored-by: Cody Stevens <costevens@datto.com>