Add date command, rm_story.md, and minor edits

- Add `date` as first command to try in 01-navigation
- Add Toy Story 2 rm -rf story (rm_story.md) and link from 05-scripting
- Minor wording tweaks in 05-scripting

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

01-navigation/README.md

@@ -43,6 +43,15 @@ Most Linux installations will boot to a GUI like Gnome or KDE. From there, you c
 
 > **Exercise 1:** Open a terminal window. Install WSL, if necessary.
 
+Once you have a terminal open, try your first command:
+
+```
+$ date
+Sat Apr  5 14:23:01 EDT 2026
+```
+
+The `date` command prints the current date and time. Not much to it — but you just ran a Unix program!
+
 
 ## 2. Two tips before we start