improve index.html interface with ninja template

site/assets/fonts/material-design/scss/_icons.scss

@@ -0,0 +1,9 @@
+@each $key, $value in $mdi-icons {
+    .#{$mdi-css-prefix}-#{$key}:before {
+        content: char($value);
+    }
+}
+.#{$mdi-css-prefix}-blank:before {
+    content: "\F68C";
+    visibility: hidden;
+}