fix: remove Twitter link from Footer

Co-authored-by: Alessandro100 <18631060+Alessandro100@users.noreply.github.com>

Author: Copilot

src/app/components/Footer.tsx

@@ -1,7 +1,6 @@
 'use client';
 import React from 'react';
 import '../styles/Footer.css';
-import TwitterIcon from '@mui/icons-material/Twitter';
 import { Button, IconButton, useTheme } from '@mui/material';
 import { GitHub, LinkedIn, OpenInNew } from '@mui/icons-material';
 import { MOBILITY_DATA_LINKS } from '../constants/Navigation';
@@ -45,17 +44,6 @@ const Footer: React.FC = () => {
         </Button>
       </a>
       <div style={{ margin: 0, display: 'flex', justifyContent: 'center' }}>
-        <IconButton
-          aria-label='twitter'
-          className='link-button'
-          color='primary'
-          component='a'
-          href={MOBILITY_DATA_LINKS.twitter}
-          target='_blank'
-          rel='noreferrer'
-        >
-          <TwitterIcon />
-        </IconButton>
         <IconButton
           aria-label='slack'
           className='link-button'

src/app/constants/Navigation.ts

@@ -9,7 +9,6 @@ export const POST_REGISTRATION_TARGET = '/verify-email';
 export const COMPLETE_REGISTRATION_TARGET = '/complete-registration';
 
 export const MOBILITY_DATA_LINKS = {
-  twitter: 'https://twitter.com/mobilitydataio',
   slack:
     'https://share.mobilitydata.org/slack?_gl=1*vdltzn*_ga*MTg3NTkzMjk0MS4xNjg1NDA4NDQ5*_ga_55GPMF0W9Z*MTY5NzIxNDMzMS4xNy4wLjE2OTcyMTQzMzIuMC4wLjA.*_ga_38D0062PPR*MTY5NzIxNDMzMS43LjAuMTY5NzIxNDMzMS4wLjAuMA..&_ga=2.58702697.2112403184.1697214331-1875932941.1685408449',
   linkedin: 'https://www.linkedin.com/company/mobilitydata/',