Got the Answer..

Don't understand why the down voting - very unnecessary..

This is the code.

function list-my-gh-pages() {
  curl -s "https://api.github.com/users/YOUR_USERNAME/repos?per_page=100" | \
  jq -r '.[] | select(.has_pages) | "\(.name): https://\(.owner.login).github.io/\(.name)"'
}

and run it:

list-my-gh-pages

works exactly like I want it to.