feat: wip on adding a log in button

[simonv3]

This seems to be working okay except that we need to set up a client for dream (I'm kind of regretting this name now lol) specifically, as well as allow the specific redirect URIs for it, which is a matter for the id server.

response Object {
  "authentication": null,
  "error": [Error: An unknown error occurred],
  "errorCode": null,
  "params": Object {
    "error": "invalid_redirect_uri",
    "state": "oDNkqZvst0",
  },
  "type": "error",
  "url": "exp://192.168.0.14:19000?error=invalid_redirect_uri&state=oDNkqZvst0",
}

[peterklingelhofer]

Should this be mobile now that the repo has been renamed?

Suggested change

	scheme: "coop.resonate.dream",
	scheme: "coop.resonate.mobile",