Update plans

Author: handotdev

advanced/custom/css.mdx

@@ -4,7 +4,7 @@ description: 'Fully customize your documentation with custom CSS'
 ---
 
 <Check>
-  Custom CSS is available on the [growth plan](https://mintlify.com/pricing).
+  Custom CSS is available as an add-on to the [pro plan](https://mintlify.com/pricing).
 </Check>
 
 Add any number of CSS files to your repository and the defined class names will be applied and available across all of your MDX files.

advanced/custom/js.mdx

@@ -4,7 +4,7 @@ description: 'Add JavaScript functionality globally'
 ---
 
 <Check>
-  Custom JS is available on the [growth plan](https://mintlify.com/pricing).
+  Custom JS is available as an add-on to the [pro plan](https://mintlify.com/pricing).
 </Check>
 
 Custom JS allows you to add custom executable code globally. It is the equivalent of adding a `<script>` tag with JS code into every page.