3D Bits intro page updated with new video and install link

Author: matas-bitbybit-dev

docs/learn/3d-bits/intro.md docs/learn/3d-bits/intro.mdxdocs/learn/3d-bits/intro.md renamed to docs/learn/3d-bits/intro.mdx

@@ -16,6 +16,14 @@ tags: [shopify, 3d-bits]
 *   Visit our **[Demo Store](https://bitbybit-dev-3d-configurators.myshopify.com)**
 *   Use password: `3d-bits-demo`
 
+<div style={{textAlign: 'left', margin: '2rem 0'}}>
+  <h2>
+    <a href="https://apps.shopify.com/3d-bits-1" target="_blank">
+      Install 3D Bits from Shopify App Store
+    </a>
+  </h2>
+</div>
+
 ## Why Use 3D Bits?
 
 Traditional online stores use static images, but modern shoppers want to see products from every angle and try out different options. 3D Bits makes this possible by letting you build interactive 3D experiences for your products—no advanced coding required.
@@ -24,7 +32,7 @@ Traditional online stores use static images, but modern shoppers want to see pro
   <iframe 
     width="560" 
     height="315" 
-    src="https://www.youtube.com/embed/UwIEYWxlGQ0?si=ZtLRjdJ8t2DXjdjl" 
+    src="https://www.youtube.com/embed/y868HEQ8-lQ" 
     title="3D Bits App For Shopify Demo" 
     frameborder="0" 
     allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"