A route override for the page. This is useful for pages where the route
can not be expressed through the filesystem routing capabilities.
The route override must be a path-to-regexp compatible route matcher.
optional
csp: boolean
If Content-Security-Policy should be enabled for this page. If 'true', a
locked down policy will be used that allows only the scripts and styles
that are generated by fresh. Additional scripts and styles can be added
using the useCSP hook.