fea: Fix horizontal scroll issue on publishing-a-package page (#7491)

Author: Shivsingh15

apps/site/layouts/Learn.tsx

@@ -16,7 +16,7 @@ const LearnLayout: FC<PropsWithChildren> = ({ children }) => (
       <WithProgressionSidebar navKey="learn" />
 
       <div>
-        <main>
+        <main className="md:w-[65vw] lg:w-[48vw]">
           {children}
 
           <WithSidebarCrossLinks navKey="learn" />