Correct grill-me attribution

README.md

@@ -36,8 +36,6 @@ file.
 
 - `gitea-issues` - work with self-hosted Gitea repositories, issues, pull
   requests, and issue dependency workflows.
-- `grill-me` - interview a user about a plan or design until the decision tree
-  is resolved.
 - `shared-abstraction-refactor` - find duplicated local patterns and promote
   obvious shared abstractions.
 
@@ -45,6 +43,8 @@ file.
 
 - `c4-diff` - copied from Jo Van Eyck's skills repository:
   https://github.com/jovaneyck/skills
+- `grill-me` - copied from Matt Pocock's skills repository:
+  https://github.com/mattpocock/skills
 - `grill-with-docs` - copied from Matt Pocock's skills repository:
   https://github.com/mattpocock/skills
 - `to-spec` - copied from Matt Pocock's skills repository:
@@ -57,8 +57,8 @@ file.
 ## Attribution
 
 Thanks to Matt Pocock for the engineering planning skills in
-https://github.com/mattpocock/skills, including `wayfinder`, `grill-with-docs`,
-`to-spec`, and `to-tickets`.
+https://github.com/mattpocock/skills, including `grill-me`, `wayfinder`,
+`grill-with-docs`, `to-spec`, and `to-tickets`.
 
 Thanks to Jo Van Eyck for the `c4-diff` skill in
 https://github.com/jovaneyck/skills.