Wrong API endpoints

[UpcraftLP]

Right now the SDK expects the api_endpoint configuration to be in the form of https://us.i.posthog.com/i/v0/e/, which means a client can only use the single event endpoint (/i/v0/e) OR the batch endpoint (/batch), but not both at the same time.

Instead, users should only need to provide a URL like https://us.i.posthog.com and have the SDK use the correct path for the right action (also in future for querying other endpoints for ex. error tracking or feature flags).

[oliverb123]

You're right and I'll fix this, but as an aside, a fun quirk of our capture endpoint is that it uses the same handler across both single-event and batch requests, so you could send a batch to /e, or a single event to /batch. I do not recommend relying on this quirk though (which is why I'll fix this to accept only hostnames)

[UpcraftLP]

Sounds good!
maybe integrate #35 in the process?