update migration taf for scalar_dynam

Author: HumphreyYang

lectures/scalar_dynam.md

@@ -20,6 +20,12 @@ kernelspec:
 (scalar_dynam)=
 # Dynamics in One Dimension
 
+```{admonition} Migrated lecture
+:class: warning
+
+This lecture has moved from our [Intermediate Quantitative Economics with Python](https://python.quantecon.org/intro.html) lecture series and is now a part of [A First Course in Quantitative Economics](https://intro.quantecon.org/intro.html).
+```
+
 ## Overview
 
 In this lecture we give a quick introduction to discrete time dynamics in one dimension.