rn-107: Add git config article

[bpugh]

Just suggesting an article I recently wrote if you all think it's a good fit.

[chriscool]

Thanks! I am Ok with this but I will let @jnareb decide as he manages this section.

[jnareb]

Thanks @bpugh . I'll adjust it slightly in post.

[bpugh]

Thanks @jnareb!
By the way, I noticed your comment on the draft, and realized my post could have been more clear that I recommend setting the rebase option if you're specifying the flag every time and not necessarily that everyone should switch to pulling with rebase.
So I updated the post to add a quick clarification. I hope that ok.

Thanks again!