Github page is not showing and keeps loading

I have published a Github Pages under this link: It is a web-map application based on OpenLayers library. However, the content of the page is not showing and the page keeps loading forever. When I open the index.html file in my local directory the content is displayed on my web browser. Here is the screenshot of the webpage when I load from my local computer.

enter image description here

What could I possibly do wrong? The link to the repository includes the javascript code:

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