Can not get my website working on github pages

Hi all! I made my personal website using html, css and react. I got a free domain name on namecheap because i have access to student developer pack . I uploaded all my code on github repository. But when I go to my domain name, I get a blank page. I tried putting a javascript alert in index.html file and I get that alert that means index.html file is being loaded but app.js file is not loading. Can anyone help me here please? I would really appreciate it.

this is my github repo:
this is my domain -