I’m trying to do this as well. I started by trying to follow the same instructions for the integration as you and got nowhere! In mid December I asked on the Home Assistant forum, and advice was to follow these instructions. Scroll down the page until you get to
There are 2 ways to install the Hive custom component see below.
The recommended way to is to install via HACS. Once HACS has been installed and setup. You just need to navigate to the HACS panel and choose integrations. This will show and option to add an integration click it and search for Hive in the presented popup.
Once installation is complete please follow the setup section to set the Hive integration up."
But I haven’t managed to install HACS even yet
However it does seem that editing the yaml file isn’t the way to do it any more.