updated dashboard schema

Author: karel26

services/dashboard/schemas/dashboard_schema.yaml

@@ -3,8 +3,13 @@ mapping:
   DEFAULT:
     type: map
     mapping:
-      hide_remote_servers: {type: bool}
-      regex;(header|servers|nodes|log):
+      servers:
+        type: map
+        mapping:
+          hide_remote_servers: {type: bool}
+          background: {type: str}
+          border: {type: str}
+      regex;(header|nodes|log):
         type: map
         mapping:
           background: {type: str}