Revise README for Tskit-based Demo Notebooks

Updated the README to reflect the new Tskit-based demo notebooks and removed outdated information.

Author: hyanwong

README.md

@@ -1,37 +1,11 @@
-# JupyterLite Demo
+# Tskit-based Demo Notebooks in JupyterLite
 
-[![lite-badge](https://jupyterlite.rtfd.io/en/latest/_static/badge.svg)](https://jupyterlite.github.io/demo)
+This is the source repository for notebooks hosted at 
 
-JupyterLite deployed as a static site to GitHub Pages, for demo purposes.
+https://tskit.dev/explore/
 
-## ✨ Try it in your browser ✨
-
-➡️ **https://jupyterlite.github.io/demo**
-
-![github-pages](https://user-images.githubusercontent.com/591645/120649478-18258400-c47d-11eb-80e5-185e52ff2702.gif)
-
-## Requirements
-
-JupyterLite is being tested against modern web browsers:
-
-- Firefox 90+
-- Chromium 89+
-
-## Deploy your JupyterLite website on GitHub Pages
-
-Check out the guide on the JupyterLite documentation: https://jupyterlite.readthedocs.io/en/latest/quickstart/deploy.html
-
-## Further Information and Updates
-
-For more info, keep an eye on the JupyterLite documentation:
+These notebooks run in any modern browser, via JupyterLite:
 
 - How-to Guides: https://jupyterlite.readthedocs.io/en/latest/howto/index.html
 - Reference: https://jupyterlite.readthedocs.io/en/latest/reference/index.html
 
-This template provides the Pyodide kernel (`jupyterlite-pyodide-kernel`), the JavaScript kernel (`jupyterlite-javascript-kernel`), and the p5 kernel (`jupyterlite-p5-kernel`), along with other
-optional utilities and extensions to make the JupyterLite experience more enjoyable. See the
-[`requirements.txt` file](requirements.txt) for a list of all the dependencies provided.
-
-For a template based on the Xeus kernel, see the [`jupyterlite/xeus-python-demo` repository](https://github.com/jupyterlite/xeus-python-demo)
-
-