Add RBAC button to homepage (#261)

Author: devalog

fern/products/home/pages/welcome.mdx

@@ -167,6 +167,11 @@ import { FernFooter } from "../../../components/FernFooter";
             <img src="./images/arrow-right-black.svg" alt="Arrow right light" className="dark:hidden" noZoom />
             <img src="./images/arrow-right-white.svg" alt="Arrow right light" className="hidden dark:block" noZoom />
           </a>
+          <a className="fern-button minimal normal w-fit gap-1 a-btn" href="/docs/authentication/rbac">
+            Control role-based access
+            <img src="./images/arrow-right-black.svg" alt="Arrow right light" className="dark:hidden" noZoom />
+            <img src="./images/arrow-right-white.svg" alt="Arrow right light" className="hidden dark:block" noZoom />
+          </a>
 
         </div>
       </div>