Added information about Mac M1/M2/M3 git installation and Github access token instructions

[fltfx]

Changes in this pull request:

• https://tutorial.djangogirls.org/en/deploy/: Added information on how to resolve using homebrew to install git for Mac M1/M2/M3 users as I think there is a bug that comes up for Mac users using the M1/M2/M3 Apple Silicon processors vs Mac Intel processor variants. We ran into an issue with a Macbook 2022 - M2 version with using brew to install git, so that's where this is stemming from.
• https://tutorial.djangogirls.org/en/deploy/: Multiple attendees ran into the issue of needing to create a Github personal access token to push their code for the first time. I added further instructions on how to generate that token and how to enter it.

[kewtree1408]

Thanks for the contribution <3
LGTM.