How to open a website in repl
How to i import a website into a repl
If you have a github and it's on your github there is a feature on repl where you can import your repo from github.
Other than that, I don't think there is a way.(I could be wrong, but I really don't think there is a way to 'import' a website into repl besides the github feature that enables you to import a github repo)