broken schelling link in docs

[abe-winter]

Describe the bug
in the best practices page here: https://github.com/projectmesa/mesa/blob/9a07a48526f11b78e462a9bab390366c95443814/docs/best-practices.rst

The schelling link is to https://github.com/projectmesa/mesa/tree/main/examples/schelling

It should probably be to either:

• the standalone schelling repo https://github.com/projectmesa/mesa-schelling-example
• the schelling folder inside the examples repo https://github.com/projectmesa/mesa-examples/tree/main/examples/Schelling

Expected behavior
link not broken

To Reproduce
click broken link

Additional context

[tpike3]

@abe-winter Good catch thanks! It should be the second the link. We need to probably get rid of some of the extra repos (i.e. schelling exmaples, presentations)

[tpike3]

Fixed with #1720