clean up redirects (#3706)

_overrides/404.html

@@ -2,29 +2,6 @@
 {% block htmltitle %}
 <title>404</title>
 {% endblock %}
-{% block extrahead %}
-<script>
-    // Create an object containing all your redirects
-    const redirects = {
-
-
-			// Use _redirects file to set redirects
-
-    };
-
-    (function redirect(){
-        
-            const currentPath = window.location.pathname + (window.location.hash ? window.location.hash : '');
-            const redirectUrl = redirects[currentPath];
-            if (redirectUrl) {
-                window.location.href = `${window.location.origin}${redirectUrl}`;
-                return;
-            }
-          
-    })();	
-  
-</script>
-{% endblock %}
 {% block content %}
   <h1>404 - Page not found</h1>
   <h2>Go <a href="/">home</a></h2>