Remove "Sign in" button from header

Because we don't have a login page

src/components/Header/Header.jsx

@@ -2,12 +2,9 @@
 import React, { useState, useEffect } from 'react';
 import { Link, useLocation } from 'react-router-dom';
 
-import { isAuthenticated, isAuthenticationEnabled, logoutUser } from '../../utilities/authUtilities';
-
 // components
-import { AppBar, Toolbar, Grid, Button } from '@mui/material';
+import { AppBar, Toolbar, Grid } from '@mui/material';
 import SearchSuggestion from './SearchSuggestion';
-import UserAccountMenu from './UserAccountMenu';
 // styling
 import makeStyles from '@mui/styles/makeStyles';
 import logo from '!file-loader!../../assets/Alt_Linux_Team.svg';
@@ -137,10 +134,6 @@ function Header({ setSearchCurrentValue = () => {} }) {
   const classes = useStyles();
   const path = useLocation().pathname;
 
-  const handleSignInClick = () => {
-    logoutUser();
-  };
-
   return (
     <AppBar position={show ? 'fixed' : 'absolute'} sx={{ height: '5rem' }}>
       <Toolbar className={classes.header}>
@@ -179,18 +172,6 @@ function Header({ setSearchCurrentValue = () => {} }) {
                 <img alt="github repository" src={githubLogo} className={classes.ghlogo} />
               </a>
             </Grid>
-            {isAuthenticated() && isAuthenticationEnabled() && (
-              <Grid item>
-                <UserAccountMenu />
-              </Grid>
-            )}
-            {!isAuthenticated() && isAuthenticationEnabled() && (
-              <Grid item>
-                <Button className={classes.signInBtn} onClick={handleSignInClick}>
-                  Sign in
-                </Button>
-              </Grid>
-            )}
           </Grid>
         </Grid>
       </Toolbar>