docs: hide section related to creating custom variant

Author: lukewalczak

docs/pages/4.fonts.mdx

@@ -393,6 +393,7 @@ Platform.select({
 
 #### Using `configureFonts` helper
 
+<div style={{display: 'none'}}>
 * If there is a need to create a custom font variant, prepare its config object including required all fonts properties. After that, defined `fontConfig` has to be passed under the <b>`variant`</b> name as `config` into the params object:
 
 ```js
@@ -427,6 +428,7 @@ export default function Main() {
   );
 }
 ```
+</div>
 
 * In order to override one of the available `variant`'s font properties, pass the modified `fontConfig` under specific <b>`variant`</b> name as `config` into the params object: