Both these forums and the Hearthstone site are part of Blizzard.com.
You’re already on the site you said you never visited.
Edit:
And for more fun, here’s the link to the official patch notes posted in the “Community Discussion” Forum:
You just never bothered to look, did you?
Second Edit:
You haven’t scrolled all the way up in that image.
If you had, you would have seen a top line set of links including Game Info, Cards, News, Community, and Shop.
News is where the Patch Notes are posted.
Community includes these forums.