message: Use link to support page on homepage
diff: -import { Grid, Typography, Box } from '@material-ui/core'
  import { useTranslation } from 'react-i18next'
  +import { Grid, Typography, Box } from '@material-ui/core'
  -import SubmitButton from 'components/common/form/SubmitButton'
  +import { routes } from 'common/routes'
  +import LinkButton from 'components/common/LinkButton'
  export default function Index() {
  const { t } = useTranslation()
  @@ -18,7 +19,9 @@ export default function Index() {
  </Typography>
  </Grid>
  <Grid item>
  - <SubmitButton variant="outlined" label="index:jumbotron.support-us-button" />
  + <LinkButton href={routes.support} variant="outlined" color="primary">
  + {t('index:jumbotron.support-us-button')}
  + </LinkButton>
  </Grid>
  </Grid>
  </Box>
  