Remove joinplu.me from Caddyfile

It is running on Netlify.

etc/caddy/Caddyfile

@@ -26,11 +26,6 @@
     file_server
 }
 
-joinplu.me {
-    import static
-    root * /usr/share/caddy/joinplu.me/build
-}
-
 docs.joinplu.me {
     import static
     root * /usr/share/caddy/docs.joinplu.me/build