Feature: Cut over to v2 API

[jpmcb]

Related: https://github.com/open-sauced/api/issues/478

---

The v1 API is being deprecated: we should update docs to reference the correct API endpoint (which will just be v2/...) for most existing services.

Example:

docs/docs/contributing/set-up-authentication.md

Lines 28 to 36 in a7b4fea

	const response = await fetch(
	"https://api.opensauced.pizza/v1/auth/session",
	{
	method: "GET",
	headers: {
	Authorization: `Bearer ${token}`,
	},
	}
	);