Removed CSS Cascade 5 from Rough Interop (#12864)

CSS Cascade 5 got promoted to Reliable Candidate Recommendations. So deleting it from Modules with Rough Interoperability.

Author: BartolomeSintes

css-2025/Overview.bs

@@ -587,11 +587,6 @@ Modules with Rough Interoperability</h3>
 			and provides more control over font choice and feature selection,
 			including support for OpenType variations.
 
-		<dt><a href="https://www.w3.org/TR/css-cascade-5/">CSS Cascading and Inheritance Level 5</a>
-		[[CSS-CASCADE-5]]
-		<dd>
-			Extends CSS Cascade 4 to add cascade layers.</dd>
-
 		<dt><a href="https://www.w3.org/TR/motion-1/">Motion Path Module Level 1</a>
 		[[MOTION-1]]
 		<dd>