Migrate to yarn berry and fix all workspace errors

frontend/pages/_app.js

@@ -0,0 +1,29 @@
+import { CssBaseline } from '@mui/material'
+import { createTheme, ThemeProvider } from '@mui/material/styles'
+import { appWithTranslation } from 'next-i18next'
+
+import 'reset-css'
+import '../styles/global.scss'
+import Layout from '../components/layout'
+import WithYandexMetrika from '../components/WithYandexMetrika'
+
+function App ({ Component, pageProps }) {
+  const theme = createTheme({
+    palette: {
+      mode: 'light'
+    }
+  })
+
+  return (
+    <WithYandexMetrika>
+      <ThemeProvider theme={theme}>
+        <CssBaseline />
+        <Layout>
+          <Component {...pageProps} />
+        </Layout>
+      </ThemeProvider>
+    </WithYandexMetrika>
+  )
+}
+
+export default appWithTranslation(App)