Reload branding file

Example response

{
  "data": {
    "branding": {
      "labelText": "Production",
      "barColor": {
        "red": 0.2,
        "blue": 0.235,
        "green": 0.01,
        "alpha": 0.5
      },
      "labelColor": {
        "red": 0.2,
        "blue": 0.235,
        "green": 0.01,
        "alpha": 0.5
      },
      "motd": "Welcome, please sign in:"
    }
  }
}