feat(about): add team member profile page

This commit introduces a new section to showcase team members, starting with the founder's profile.

- Adds a dynamic page route `/about/` to display individual member profiles.
- Creates a new `about` content collection to source profile information from Markdown files.
- Adds the first profile for 'Xiaomai', including a detailed resume and background image.
- Integrates a 'Teams' dropdown into the main navigation header.
- Implements a `copyToClipboard` utility with a toast notification for sharing profile links.

app/composables/NavLinks.ts

@@ -80,6 +80,14 @@ export const useNavLinks = () => {
         },
       ],
     },
+    {label: t("common.header.teams.label"),
+      icon: "mdi:account-group-outline",
+      children: [{
+        label: t("common.header.teams.children.xiaomai.label"),
+        description: t("common.header.teams.children.xiaomai.description"),
+        to: '/about/xiaomai'
+      }]
+    }
   ]);
 
   return navLinks;