Update and rename code-beautifier.html to index.html

Author: tawhidurrahmandear

code-beautifier.html renamed to index.html

@@ -23,4 +23,4 @@
     <div>
         <button class="code-beautifier_button" onclick="clearAll()">Clear</button>
         <button class="code-beautifier_button" onclick="copyCode()">Copy Code</button>
-    </div>
+    </div>