Happy to do it for you if you can't get it working, but basically all you need to do is push the static files to the root of the repo or a folder, and then go to the repo settings => Pages, and then under build and deployment select "deploy from branch" then select master (or main) and then the location (root of the repo or the folder you pushed the files to).

Then add your custom domain, and then create DNS A records that point to:

185.199.108.153

185.199.109.153

185.199.110.153

185.199.111.153

Give it like half an hour after that and it should work