chore: update to Fumadocs 15.7 (#4154)

Co-authored-by: KinfeMichael Tariku <65047246+Kinfe123@users.noreply.github.com>
Co-authored-by: Kinfe123 <kinfishtech@gmail.com>

docs/lib/is-active.ts

@@ -0,0 +1,10 @@
+export function isActive(
+	url: string,
+	pathname: string,
+	nested = true,
+): boolean {
+	if (url.endsWith("/")) url = url.slice(0, -1);
+	if (pathname.endsWith("/")) pathname = pathname.slice(0, -1);
+
+	return url === pathname || (nested && pathname.startsWith(`${url}/`));
+}