Is your feature request related to a problem? Please describe.
NPM is a beautiful project and many of us run it as the hub for internal sites and give them https.
It will be great to be able to support an option to enable an auth-less home page on the management site(81), that shows all the available sites hosted on this.

Describe the solution you'd like
In the admin settings, there is a checkbox (default to false) that will enable this feature:
For un-authenticated access, just show the current list of hosts except nothing can be modified.

Describe alternatives you've considered
manually create a static page. Not hard at all, but NPM already have such a nice page.

Additional context
It will be even better if for each host, we can config a description, which shows up in the list view for the home page.