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/utils/clipboard.ts

@@ -0,0 +1,13 @@
+export function copyToClipboard(
+  toCopy: string,
+  message: string = "Copied to clipboard"
+) {
+  const toast = useToast();
+  navigator.clipboard.writeText(toCopy).then(() => {
+    toast.add({
+      title: message,
+      color: "success",
+      icon: "i-lucide-check-circle",
+    });
+  });
+}