How to make an "Open in CoCalc" link for a Notebook

[williamstein]

This

[<img src="https://cocalc.com/_next/static/media/icon.9f1b8851.svg" width=20/> Open in CoCalc
](https://cocalc.com/github/NVIDIA/cuda-q-academic/blob/main/quick-start-to-quantum/01_quick_start_to_quantum.ipynb)

renders as

Open in CoCalc

The URL is from the "paste a URL to a GitHub repository or Gist" feature at https://cocalc.com/share