Matt Pagan:
On the other hand, having a locked down manual reader in the browser seems like it would be the most user-friendly option.
Another option. The manual has no external resources and we rely on the system browser. In the Tor Browser archive, there's a symlink to a page like the following one: https://people.torproject.org/~lunar/volatile/manual/
There's probably many style and UX improvements that can be made, but you can get the idea.