add carbon native mobile Figma kit link (carbon-design-system#3922)

Author: thyhmdo

src/pages/designing/design-resources/index.mdx

@@ -200,9 +200,8 @@ project underway.
 
 <Column colLg={4} colMd={4} noGutterSm>
   <ResourceCard
-    subTitle="Figma kit coming soon"
-    disabled
-    href=""
+    subTitle="(Beta) Carbon Native"
+    href="https://www.figma.com/file/O3KSDu2TWpMaazGkgsKqLA/(Beta)-Carbon-Native---Carbon-Design-System?type=design&node-id=58%3A2763&mode=design&t=tXtq2rcaczpgvPSa-1"
     actionIcon="launch">
     <MdxIcon name="figma" />
   </ResourceCard>