feat: add demo fallback and regenerate media

- Regenerated demo.gif with vhs
- Added demo-static.png (first frame) for faster loading/fallback
- Updated index.html to fallback to PNG if GIF fails

Author: Bharath-code

demo.gif

@@ -17,7 +17,7 @@ Set Theme "Catppuccin Mocha"
 Hide
 Type "export PS1='> '"
 Enter
-Clear
+Ctrl+L
 Show
 
 # Start the demo

demo.tape

@@ -561,7 +561,7 @@ <h2 style="font-size: clamp(2rem, 4vw, 2.5rem); margin-bottom: 2rem; font-weight
                     <div class="dot green"></div>
                 </div>
                 <img src="https://raw.githubusercontent.com/Bharath-code/git-scope/main/demo.gif"
-                    alt="Git Scope Demo GIF">
+                    onerror="this.onerror=null; this.src='demo-static.png'" alt="Git Scope Demo GIF">
             </div>
         </section>