feat: added links to core libraries (#1674)

Author: NataliaTepluhina

.vitepress/config.ts

@@ -34,6 +34,13 @@ const nav = [
     text: 'Ecosystem',
     activeMatch: `^/ecosystem/`,
     items: [
+      {
+        text: 'Core Libraries',
+        items: [
+          { text: 'Vue Router', link: 'https://router.vuejs.org/' },
+          { text: 'Pinia', link: 'https://pinia.vuejs.org/' }
+        ]
+      },
       {
         text: 'Resources',
         items: [