Added a threads flag to have email appear as threads. 
The only things I didn't add was a the capability of adding sent mail to the threads. I'm unsure of the best way to solve that issue.

added fidei.email service provider

This reverts commit 67b704808d.

For increased legibility.

Added the option to have a `mailcap` file in `.config/mutt/`. This enables ease of changing what programs are used for viewing.

avoid line splitting.
the width option is set to 80 by default, increasing it will avoid breaking long links in two different lines

Add domains for uclive.ac.nz addresses.
These are undergrad (and maybe other) addresses for
the University of Canterbury (https://canterbury.ac.nz/).