remove bold styling from C++ keywords

Author: julioest

antora-ui/src/css/cpp-highlight.css

@@ -3,11 +3,10 @@
  * This replaces highlight.js's C++ highlighting for consistent styling
  */
 
-/* C++ Keywords - blue, bold */
+/* C++ Keywords - blue */
 code.cpp-highlight .cpp-keyword,
 .doc pre.highlight code.cpp-highlight .cpp-keyword {
   color: #00f;
-  font-weight: bold;
 }
 
 /* C++ Strings - dark red */