fix: og img link

Author: TheSTL

public/index.html

@@ -3,7 +3,7 @@
   <meta property="og:title" content="Visualize Sorting Algorithms" />
   <meta property="og:description" content="Visualize sorting algorithms in a better way." />
   <meta property="og:image"
-    content="/merge-sort.gif" />
+    content="https://visualize-sorting-better.netlify.app/merge-sort.gif" />
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <meta name="theme-color" content="#000000" />