How to get rid of Home Assistant vulnerable stuff?

So I installed Hacs and Mushroom. How to I uninstall all that stuff? I deleted the integration, but the Mushroom components were still there on a dashboard.

Apparently there are some security vulnerabilities and I’d just as soon get rid of those since I’m not really using them.

… time passes …

Now I tried to download the latest Home Assistant into Docker on my Synology NAS, started it, then went to the browser and it is just stuck on “Initializing”… Now what?