Change payment method order & add new asso link

pages/index.js

@@ -70,9 +70,16 @@ export default function Home({errorCode, errorMessage, stats}) {
             </Typography>
           </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> <OpenInNewIcon fontSize='small' />
+          <Box sx={{marginBottom: 2}}>
+            <Button variant='outlined' onClick={() => window.open('https://asso.oki.re/public/members/new.php', '_blank')}>
+              <strong>Adhérez à l’association #OKi</strong> <OpenInNewIcon fontSize='small' />
             </Button>
+          </Box>
+          <Box>
+            <Button variant='outlined' onClick={() => window.open('https://o-k-i.net', '_blank')}>
+              <strong>#OKi sur le Fédiverse ➡️ o-k-i.net</strong> <OpenInNewIcon fontSize='small' />
+            </Button>
+          </Box>
           </Container>
         </Box>
         <Container sx={{flexGrow: 100}}>