Revert "disable admin login"

This reverts commit eb15f4b29c.

components/header.tsx

@@ -2,6 +2,7 @@ import { useState } from 'react'
 import Head from 'next/head'
 import Link from 'next/link'
 import { useRouter } from 'next/router'
+import User from './user'
 
 const NAV_ENTRIES = [
   {
@@ -59,6 +60,7 @@ export default function Header() {
                   </a>
                 )
               })}
+              <User />
             </nav>
             <nav
               onClick={() => setHamburgerOpen(!hamburgerOpen)}
@@ -96,6 +98,7 @@ export default function Header() {
                         </a>
                       )
                     })}
+                    <User />
                   </div>
                 </div>
               </div>