Add checkpoints tutorial video to documentation (#205)

Author: SannidhyaSah

docs/features/checkpoints.md docs/features/checkpoints.mdxdocs/features/checkpoints.md renamed to docs/features/checkpoints.mdx

@@ -8,6 +8,24 @@ Checkpoints let you:
 - Compare different implementation approaches
 - Revert to previous project states without losing work
 
+<div style={{ position: 'relative', paddingBottom: '56.25%', height: 0, overflow: 'hidden' }}>
+  <iframe title="Checkpoints Tutorial Video"
+    src="https://www.youtube.com/embed/Ho30nyY332E"
+    style={{
+      position: 'absolute',
+      top: 0,
+      left: 0,
+      width: '100%',
+      height: '100%',
+    }}
+    frameBorder="0"
+    allow="autoplay; encrypted-media"
+    allowFullScreen
+  ></iframe>
+</div>
+
+<div style={{ marginTop: '20px' }}></div>
+
 :::info Important Notes
 - **Checkpoints are enabled by default.**
 - **Git must be installed** for checkpoints to function - [see installation instructions](#git-installation)

docs/tutorial-videos.json

@@ -19,6 +19,10 @@
     {
       "id": "qgqceCuhlRA",
       "title": "Custom Modes in Roo Code | Official Tutorial "
+    },
+    {
+      "id": "Ho30nyY332E",
+      "title": "Checkpoints in Roo Code | Official Tutorial"
     }
   ]
 }