feat(skills): add "what-the" skill for plain-English breakdowns (#3026)

Adds a /what-the skill that responds with a plain-English request to
explain the who, what, where, why, and when of something technical.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: thedotmack

plugin/skills/what-the/SKILL.md

@@ -0,0 +1,6 @@
+---
+name: what-the
+description: "What the? Use when the user wants a plain-English breakdown of something technical — the who, what, where, why, and when."
+---
+
+that sounds mad technical. explain to me the who, what, where, why, and when of this