[Marketing] Rebase-helper article

[Ryan Lerch]

Hi all,

I have just completed my edit of the rebase-helper article! I did a little
pruning to try to make it more suitable for the magazine audience, but i
think it is pretty much ready to go in my book. I have also added a
featured image to it as well.

https://fedoramagazine.org/?p=12367&preview_id=12367&preview_nonc...

Petr, would you be able to double check my changes to the article, just to
make sure things i have written are technically correct?

cheers,
ryanlerch