add less files for new mg icons

resources/less/metager/metager.less

@@ -20,4 +20,5 @@
 @import "./parts/type.less";
 @import "./parts/scaffolding.less";
 @import "./parts/button.less";
-@import "./parts/dropdowns.less";
+@import "./parts/dropdowns.less";
\ No newline at end of file
+@import "./parts/mg-icons.less";

resources/less/metager/parts/mg-icons.less

+.mg-icon {
+    height: 0.8em;
+    vertical-align: baseline;
+}
\ No newline at end of file