Broken link and deprecated Git Community Book

[Mouseion]

The link for Git Community Book is no longer active as the book has been deprecated (see @schacon's announcement, Community Book Deprecation section).

Hence, it might be better to replace with the Pro Git Book as that's what replaced the Community Book? Or if you prefer the Community Book, an active link mentioned in the announcement is here, but because it's the uncompiled version, it might not be a good link to replace the broken link.

Either way, if needed, I wouldn't mind sending you a PR for this update.

[skwp]

Yes please send a PR to the Pro Git Book