refactor: rename site to frontend

frontend/src/components/layouts/layout.tsx

@@ -0,0 +1,16 @@
+import { Center, Flex } from "@mantine/core";
+import { ReactNode } from "react";
+import { LanguageSelector } from "../language-selector/language-selector";
+
+export const Layout = ({ children }: { children: ReactNode }) => {
+  return (
+    <>
+      <LanguageSelector />
+      <Center style={{ minHeight: "100vh" }}>
+        <Flex direction="column" flex="1" maw={340}>
+          {children}
+        </Flex>
+      </Center>
+    </>
+  );
+};