Please also see FAQ.IIAB.IO, specifically: "What is local_vars.yml and how do I customize it?"
Here is an example MEDIUM-sized
/etc/iiab/local_vars.yml including a suite of about a dozen Internet-in-a-Box (IIAB) server apps — that have been well-tested on Raspberry Pi 3 and similar computers: https://github.com/iiab/iiab/blob/master/vars/local_vars_medium.yml
WARNING: on small Internet-in-a-Box devices, it's common to want a "Rapid Power Off" button clickable by all users in a clinic or home. Conversely, schoolteachers commonly want to disable this Power Off button, changing the "allow_apache_sudo" flag to "False".