Support conditional offline mode

[depatchedmode]

Right now, the control panel is the slowest part because it:

1. checks to see if it has the latest version, and then downloads the latest if not
2. runs in production build mode

We should default to launching the cloud hosted control panel unless the user passes an --offline flag.

Edit: from Andy:

• Let's default to pointing users to the hosted CP
• Load the local CP if the config has different ports, because we will need to modify the .env file
• Update the docs