Cleanup startup logo (#150)

* startup dhcp

* startup dnsmasq

* startup duckdns

* startup mariadb

* startup nginx

* Update config.json

mariadb/config.json

@@ -4,7 +4,7 @@
   "slug": "mariadb",
   "description": "MariaDB Server is one of the most popular database servers in the world.",
   "url": "https://home-assistant.io/addons/mariadb/",
-  "startup": "before",
+  "startup": "system",
   "boot": "auto",
   "ports": {
     "3306/tcp": 3306