Refactor Navigation component to remove external links

This commit removes the code that handles external links in the Navigation component. The code for fetching and displaying external links has been commented out, as it is no longer needed. This change improves the clarity and maintainability of the code.

packages/studiocms_core/src/components/Navigation.astro

@@ -1,7 +1,7 @@
 ---
 import { Avatar } from 'studiocms:components';
 import { StudioCMSRoutes } from 'studiocms:helpers/routemap';
-import { externalNav } from 'virtual:studiocms/pluginSystem';
+// import { externalNav } from 'virtual:studiocms/pluginSystem';
 import './navigation.css';
 import { pathWithBase } from 'studiocms:helpers';
 import { getPageList, getSiteConfig } from 'studiocms:helpers/contentHelper';
@@ -50,14 +50,14 @@ for (const page of restOfPages) {
 	});
 }
 
-const externalLinks = Array.from(externalNav.values());
+// const externalLinks = Array.from(externalNav.values());
 
-for (const link of externalLinks) {
-	links.push({
-		text: link.text,
-		href: pathWithBase(link.slug),
-	});
-}
+// for (const link of externalLinks) {
+// 	links.push({
+// 		text: link.text,
+// 		href: pathWithBase(link.slug),
+// 	});
+// }
 ---
 
 <!-- If no dropdown items -->