Rename server key in config to cacheServerUrl

[coryhouse]

The server key is ambiguous, especially since a web app has a webserver, a push endpoint which might be on a different server, and likely other servers. So, suggest renaming to clarify.

If this is accepted, then I suggest updating example apps to reference the Vite env var like this:

const z = new Zero({
  userID,
  auth: () => encodedJWT,
  cacheServerUrl: import.meta.env.VITE_ZERO_CACHE_SERVER_URL, 
  schema,
});

(hello-zero currently uses VITE_PUBLIC_SERVER which is ambiguous)

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[aboodman]

Good suggestion.