replace colab with link to static notebook

Author: CosmoMatt

README.md

@@ -4,7 +4,7 @@
 [![image](https://badge.fury.io/py/s2fft.svg)](https://badge.fury.io/py/s2fft)
 [![image](http://img.shields.io/badge/arXiv-2311.14670-orange.svg?style=flat)](https://arxiv.org/abs/2311.14670)<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
 [![All Contributors](https://img.shields.io/badge/all_contributors-6-orange.svg?style=flat-square)](#contributors-) <!-- ALL-CONTRIBUTORS-BADGE:END --> 
-[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/drive/1YmJ2ljsF8HBvhPmD4hrYPlyAKc4WPUgq?usp=sharing)
+[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/astro-informatics/s2fft/blob/main/notebooks/spherical_harmonic_transform.ipynb)
 <!-- [![image](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) -->
 
 <img align="left" height="85" width="98" src="./docs/assets/sax_logo.png">