B2B-88: add starter kit structure and elements

packages/email-templates/src/components/footer.tsx

@@ -0,0 +1,11 @@
+import { Container, Text } from '@react-email/components';
+
+export function EmailFooter(props: React.PropsWithChildren) {
+  return (
+    <Container>
+      <Text className="px-4 text-[12px] leading-[20px] text-gray-300">
+        {props.children}
+      </Text>
+    </Container>
+  );
+}