Add icon to fediverse link

pages/index.js

@@ -7,6 +7,7 @@ import Chip from '@mui/material/Chip'
 import Grid from '@mui/material/Grid'
 import Button from '@mui/material/Button'
 import ArrowCircleDownIcon from '@mui/icons-material/ArrowCircleDown'
+import OpenInNewIcon from '@mui/icons-material/OpenInNew'
 
 import HeadLayout from '../components/head-layout'
 import Footer from '../components/footer'
@@ -70,7 +71,7 @@ export default function Home({errorCode, errorMessage, stats}) {
           </Container>
           <Container align='center'>
             <Button variant='outlined' size='large' onClick={() => window.open('https://o-k-i.net', '_blank')}>
-              <strong>Fédiverse ➡️ o-k-i.net</strong>
+              <strong>Fédiverse ➡️ o-k-i.net</strong> <OpenInNewIcon fontSize='small' />
             </Button>
           </Container>
         </Box>