chore: add https://www.boniface.me/ to the websites list (#184)

I'm absolutely loving this theme, looks fantastic and is highly
functional. I did make a few tweaks to my instance though!

README.md

@@ -266,6 +266,7 @@ If you are using this theme for any website, feel free to list the website here.
 - <https://heckintosh.github.io/>
 - <https://dieter.plaetinck.be/>
 - <https://jmbhughes.com/>
+- <https://www.boniface.me/>
 
 ## Support