Sends the signed event event to the events endpoint of the instance at
origin, and returns whether it took it. A 4xx other than 429 means it never
will, which the caller treats as delivered.
Parameters
origin: string
event: string
Return Type
Promise<boolean>
Throws
Error
When it can't be reached, or answers 429 or a 5xx.
Usage
import { postEvent } from "api/remote/gerbeur-instance.ts";