Every hyperdrive has a manifest file at
/index.json. This file is used by the browser to store various kinds of metadata, including the title and description of the drive.
Note: the manifest schema is still under development and may change.
An example manifest:
A string identifying the title of the drive.
A string providing a description of the drive's contents.
A string identifying the URL of a drive which this drive has forked.
A string specifying the Content-Security Policy header to use in all drive resources.