message: feat: add Snackbar to Layout
diff: import Head from 'next/head'
  import { Box, Container, createStyles, makeStyles, Typography } from '@material-ui/core'
  -
  import Nav from 'components/layout/Nav'
  import Footer from 'components/layout/Footer'
  +import Snackbar from 'components/layout/Snackbar'
  type LayoutProps = React.PropsWithChildren<{
  title?: string
  @@ -41,6 +41,7 @@ export default function Layout({ title, children }: LayoutProps) {
  )}
  {children}
  </Box>
  + <Snackbar />
  <Footer />
  </Container>
  )
  