Good to see a detailed guide. Blocky sounds really interesting. I used pi-hole first and switched to adguard-home for it's dot/doh features. Blocky could be best of both world's, but the missing interface is problematic, or isn't it?
I do wish there was a web interface. It's easier footgun yourself with an all text configuration. That said, I choose to use Blocky purely based on the performance. There is a web interface someone made but I think it's really early stages. https://github.com/Mozart409/blocky-frontend
What I see is that you can disable blocking (which is possible in the grafana dashboard), refresh the block list (which happens automatically when you restart the service), and run a dns query. Configuration of any sort doesn't appear to be possible from this project.