fix: buffer is not available in some envs

HCRC-178

Author: nikomakela

src/core/pageContent/sidebarContent/SidebarCardsList.tsx

@@ -28,9 +28,7 @@ export default function SidebarCardsList({ cards }: CardsListItemProps) {
             internalHrefOrigins,
             getIsHrefExternal,
           );
-          const key = `sidebar-card-${Buffer.from(
-            `${card.title}-${uri}`,
-          ).toString('base64')}`;
+          const key = btoa(`sidebar-card-${card.title}-${uri}`);
           return (
             <SimpleCard
               key={key}