Move Header component to top level of the routes that need it

Change-Id: I1c20b1ccb52b12e7f1c047f5279f0ba6be98c5c7
diff --git a/client/src/pages/AccountSettings.tsx b/client/src/pages/AccountSettings.tsx
index f7b5e4f..218824e 100644
--- a/client/src/pages/AccountSettings.tsx
+++ b/client/src/pages/AccountSettings.tsx
@@ -18,13 +18,11 @@
 import { Container } from '@mui/material';
 
 import AccountPreferences from '../components/AccountPreferences';
-import Header from '../components/Header';
 
 export default function AccountSettings() {
   // TODO: Improve component and sub-components UI.
   return (
     <Container maxWidth="sm">
-      <Header />
       <AccountPreferences />
     </Container>
   );
diff --git a/client/src/pages/Messenger.tsx b/client/src/pages/Messenger.tsx
index 64aaaab..4f552b9 100644
--- a/client/src/pages/Messenger.tsx
+++ b/client/src/pages/Messenger.tsx
@@ -19,13 +19,11 @@
 import { ReactNode } from 'react';
 
 import ConversationList from '../components/ConversationList';
-import Header from '../components/Header';
 
 const Messenger = ({ children }: { children?: ReactNode }) => {
   return (
     <Box display="flex" height="100%">
       <Stack flexGrow={0} flexShrink={0} overflow="auto">
-        <Header />
         <ConversationList />
       </Stack>
       <Box flexGrow={1} display="flex" position="relative">
diff --git a/client/src/router.tsx b/client/src/router.tsx
index 680aa06..9872e51 100644
--- a/client/src/router.tsx
+++ b/client/src/router.tsx
@@ -20,6 +20,7 @@
 import App, { appLoader } from './App';
 import ContactList from './components/ContactList';
 import ConversationView from './components/ConversationView';
+import Header from './components/Header';
 import AuthProvider from './contexts/AuthProvider';
 import CallManagerProvider from './contexts/CallManagerProvider';
 import ConversationProvider from './contexts/ConversationProvider';
@@ -49,6 +50,7 @@
             <WebSocketProvider>
               <UserMediaProvider>
                 <CallManagerProvider>
+                  <Header />
                   <Outlet />
                 </CallManagerProvider>
               </UserMediaProvider>