B2B-88: add starter kit structure and elements

app/(marketing)/layout.tsx

@@ -0,0 +1,17 @@
+import { SiteFooter } from '~/(marketing)/_components/site-footer';
+import { SiteHeader } from '~/(marketing)/_components/site-header';
+import { withI18n } from '~/lib/i18n/with-i18n';
+
+function SiteLayout(props: React.PropsWithChildren) {
+  return (
+    <div className={'flex min-h-[100vh] flex-col'}>
+      <SiteHeader />
+
+      {props.children}
+
+      <SiteFooter />
+    </div>
+  );
+}
+
+export default withI18n(SiteLayout);