Revert "Redirect index to what-is-safe server-side (#420)"

This reverts commit 6b7fc77.

pages/index.tsx

@@ -1,14 +1,14 @@
-import type { GetStaticProps } from 'next'
+import { useRouter } from 'next/router'
+import { useEffect } from 'react'
 
-const RedirectIndex: React.FC = () => <></>
+const RedirectIndex: React.FC = () => {
+  const { push } = useRouter()
 
-export default RedirectIndex
+  useEffect(() => {
+    void push('/home/what-is-safe')
+  }, [push])
 
-export const getStaticProps: GetStaticProps = async () => {
-  return {
-    redirect: {
-      destination: '/home/what-is-safe',
-      permanent: true
-    }
-  }
+  return <></>
 }
+
+export default RedirectIndex