PagerDuty Auto Install

[CGA1123]

Currently, you have to manually set up the PagerDuty Webhooks for every service you want slackerduty to know about, this is pretty laborious and unnecessary.

The PagerDuty API exposes endpoints to manage extensions which is what webhooks come under for them.

Would be cool to have some facility to manage adding/removing slackerduty webhooks via the web UI.

Not sure what the best way to maintain consistency between slackerduty & PagerDuty would be? Maybe ping the extensions endpoint and try to regex match on a slackerduty URL that matchers with the current organisations pager_duty_token?