docs(storybook): fix incorrect package name in documentation

Author: junwen-k

apps/storybook/src/stories/introduction.mdx

@@ -52,14 +52,14 @@ A plugin for Tailwind CSS that generates shadow utilities based on [Neumorphism
 Install the plugin with your favorite package manager:
 
 ```sh
-npm install -D tailwindcss-neumorphism-plugin
+npm install -D tailwindcss-neumorphism-ui
 ```
 
 Then add the plugin to your main `style.css` file:
 
 ```diff
   @import "tailwindcss";
-+ @plugin "tailwindcss-neumorphism-plugin";
++ @plugin "tailwindcss-neumorphism-ui";
 ```
 
 ## Usage