update content

Author: mmcky

lectures/intro.md

@@ -15,7 +15,11 @@ This website presents a set of lectures on Python programming for economics and
 [Thomas J. Sargent](http://www.tomsargent.com/) and [John Stachurski](http://johnstachurski.net/). This is the first text in the series, which focuses on programming in Python.
 
 ```{admonition} News
-This site is the first of three to get update
+[QuantEcon](https://quantecon.org) is moving to use the [Jupyter Book](https://jupyterbook.org/intro.html)
+build system for all of its projects. We are a founding member of the
+[executable books organization](https://github.com/executablebooks) and this
+is the first in the QuantEcon lecture series to make this migration. We hope you like it -- if you have any
+feedback please let us know at contact@quantecon.org
 ```
 
 For an overview of the series, see [this page](https://quantecon.org/python-lectures/)