Use seasonal palette image in README

- Swap example screenshot to bash-pallete.png

README.md

@@ -273,7 +273,7 @@ If you see squares or missing glyphs, your terminal is likely using a non-Nerd f
 This prompt shows:
 
 <p align="center">
-  <img src="images/image.png" width="900">
+  <img src="images/bash-pallete.png" width="900">
 </p>
 
 With exit-status colored arrow and emoji reflecting time of day.