fix: use relative path for main script

Author: NoUsernameAvailable

index.html

@@ -108,7 +108,7 @@ <h1>BibTeX Parser</h1>
     </div>
   </div>
 
-  <script type="module" src="/src/main.js"></script>
+  <script type="module" src="./src/main.js"></script>
 </body>
 
 </html>