Document steps for building and configuring manually

[rushmorem]

The book mentions that you can compile from source using make. This is great. However, it would even be better if we also have instructions on how to build and configure manually without using the Makefile. Specifically, mention:-

• cargo build --release,
• and how to setup /etc/intecture

so commands like inauth_cli user add <username> can just work out of the out of the box.

[petehayes102]

Agreed. I got lazy on that one! I'll add it to the list.

[petehayes102]

This is now covered in the reference section of the book. For example, here's the Auth install guide: https://intecture.io/book/rust/ch05-03-01-reference-auth-installation.html