Connecting to JupyterHub from vscode.dev

Accessing JuptyerHub from [vscode.dev, github.dev or the like requires some special configuration of the JupyterHub application.

• Generate a configuration file for JuptyerHub as defined in the JupyterHub configuration docs
• Ensure the configuration file has the following settings to allow access to JupyterHub from other web applications:  

origin = '*'
c.Spawner.args = [f'--NotebookApp.allow_origin={origin}']
c.JupyterHub.tornado_settings = {
    'headers': {
        'Access-Control-Allow-Origin': origin,
        'Access-Control-Allow-Private-Network': 'true',
    },
}