Add TEST repository banners to README and site title

Author: mmcky

README.md

@@ -1,7 +1,15 @@
-# A First Course in Quantitative Economics with Python
+# ⚠️ TEST REPOSITORY - A First Course in Quantitative Economics with Python
+
+> **🧪 This is a test repository for QuantEcon Actions development**  
+> **Do not use for production purposes**  
+> Production repository: [lecture-python-intro](https://github.com/QuantEcon/lecture-python-intro)
 
 An Undergraduate Lecture Series for the Foundations of Computational Economics
 
+## Purpose
+
+This repository is a clone of `lecture-python-intro` used for testing the QuantEcon composite actions from [quantecon/actions](https://github.com/QuantEcon/actions).
+
 ## Jupyter notebooks
 
 Jupyter notebook versions of each lecture are available for download
@@ -10,7 +18,6 @@ via the website.
 ## Contributions
 
 To comment on the lectures please add to or open an issue in the issue tracker (see above).
-
 We welcome pull requests!  
 
 Please read the [QuantEcon style guide](https://manual.quantecon.org/intro.html) first, so that you can match our style.

lectures/_config.yml

@@ -1,4 +1,5 @@
-title: A First Course in Quantitative Economics with Python
+# ⚠️ TEST REPOSITORY
+title: "(TEST) A First Course in Quantitative Economics with Python"
 author: Thomas J. Sargent & John Stachurski
 logo: _static/qe-logo.png
 description: This website presents introductory lectures on computational economics, designed and written by Thomas J. Sargent and John Stachurski.