Page Not found error on my page

Hello,
I have setted up my website, I also setted up my custom domain ( https://discardbot.tk/ )
But when i go to the domain, i get the page not found error.
I have logged in with github.
i have a file called index.html.
I haven’t setted up the build settings yet.

Hello, some updates.

I got working the main site.
But there is no css added to it, only html.
Also when i try to go to other pages. It shows the page not found error.

Hello, i come with updates!

I got everything working now!