Replaced remaining parts of app to use Redux.

client/src/components/header/header.component.jsx

@@ -1,4 +1,3 @@
-import { useApolloClient } from "@apollo/react-hooks";
 import { Col, Icon, Menu, Row } from "antd";
 import React from "react";
 import { useTranslation } from "react-i18next";
@@ -7,21 +6,15 @@ import CurrentUserDropdown from "../current-user-dropdown/current-user-dropdown.
 import GlobalSearch from "../global-search/global-search.component";
 import ManageSignInButton from "../manage-sign-in-button/manage-sign-in-button.component";
 
-export default ({ landingHeader, navItems, selectedNavItem }) => {
-  const apolloClient = useApolloClient();
+export default ({ landingHeader, selectedNavItem }) => {
   const { t } = useTranslation();
 
-  const handleClick = e => {
-    apolloClient.writeData({ data: { selectedNavItem: e.key } });
-  };
-
   return (
     <Row type="flex" justify="space-around">
       <Col span={16}>
         <Menu
           theme="dark"
           className="header"
-          onClick={handleClick}
           selectedKeys={selectedNavItem}
           mode="horizontal"
         >