[css-2026] Add empty Security and Privacy sections to avoid the bikeshed warning which was blocking auto-publication.

Author: svgeesus

css-2026/Overview.bs

@@ -1082,6 +1082,18 @@ Fallback encoding:
 	document declares its encoding to be UTF-8.
 </pre>
 
+<h2 id="security">
+	Security Considerations
+</h2>
+
+Please see the Security Considerations of the individual CSS modules.
+
+<h2 id="privacy">
+	Privacy Considerations
+</h2>
+
+Please see the Privacy Considerations of the individual CSS modules.
+
 <h2 id="indices">Indices</h2>
 
 <em>These sections are non-normative.</em>