Prevent robots for indexing the 404 page

public/404.html

@@ -5,12 +5,16 @@
     <meta name="viewport"
           content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
     <meta http-equiv="X-UA-Compatible" content="ie=edge">
+    <meta name="robots" content="noindex">
+
     <title>404 - Page introuvable</title>
+
     <link rel="apple-touch-icon" sizes="180x180" href="assets/images/favicon/apple-touch-icon.png?v=oLnE8zppbY">
     <link rel="icon" type="image/png" sizes="32x32" href="assets/images/favicon/favicon-32x32.png?v=oLnE8zppbY">
     <link rel="icon" type="image/png" sizes="16x16" href="assets/images/favicon/favicon-16x16.png?v=oLnE8zppbY">
     <link rel="mask-icon" href="assets/images/favicon/safari-pinned-tab.svg?v=oLnE8zppbY" color="#5561d9">
     <link rel="shortcut icon" href="assets/images/favicon/favicon.ico?v=oLnE8zppbY">
+
     <script type="text/javascript">
         document.write("<base href=\"" + document.location.protocol + "//" + document.location.host + "/\" />");
     </script>

public/robots.txt

@@ -3,5 +3,6 @@ Disallow:
 
 User-agent: *
 Allow: /
+Disallow: /404.html
 
 Sitemap: https://vitemadose.covidtracker.fr/sitemap.xml