korhonen.cc: add finnish 404 page

docker/korhonen.cc/nginx.conf

@@ -12,6 +12,10 @@ server {
 			access_log off;
 			add_header Cache-Control "public";
 		}
+
+		location /fi {
+			error_page 404 /fi/404.html;
+		}
 	}
 
 	# Use hugo 404 page