fix bad yaml merge

Author: cscheid

_quarto.yml

@@ -14,7 +14,6 @@ project:
 highlight-style: a11y
 
 website:
-  llms-txt: true
   title: "Quarto"
   image: "quarto-dark-bg.jpeg"
   favicon: "favicon.png"
@@ -722,4 +721,4 @@ freeze: true
 
 profile:
   group:
-    - [prelease, rc]
+    - [prerelease, rc]