Add GNU stow tutorial resource

[jbhammon]

Description

This project is a great resource I just found, thanks!

GNU Stow is mentioned on the site as a possible utility to manage dotfiles, so I thought it'd be good to include this great tutorial I found about how to accomplish that.

Copyright Assignment

• [x] This document is covered by the MIT License, and I agree to contribute this PR under the terms of the license.

Things to look out for in your PR

Make sure that if your notes field in any additions/updates you make to the YAML files in the _data directory contains any : characters that the entire field is quoted as shown below:

Valid:

foo: "bar: baz"

Invalid:

foo: bar: baz

[jbhammon]

@unixorn Not sure if you want to trying running this CI job again to see if it'll pass? The failure doesn't seem related to my change.