Graphical sudo install prompt

Fixed

• No longer fails on install on system accounts that don’t have passwordless sudo set up. Instead, shows a graphical password box to get the person’s sudo password. (Fixes https://source.small-tech.org/site.js/lib/auto-encrypt-localhost/-/issues/17. See npm/cli#2887 for the original npm bug.

(Combined changelog between 7.0.3 and 7.0.4 tags. The former was missing the screenshot of the graphical sudo interface.)