message: Fix plugin template too
diff: import React, { FC } from 'react';
  -import { Typography, Grid, makeStyles, Theme } from '@material-ui/core';
  -import { InfoCard, Header, Page, pageTheme } from '@spotify-backstage/core';
  +import { Typography, Grid } from '@material-ui/core';
  +import {
  + InfoCard,
  + Header,
  + Page,
  + pageTheme,
  + Content,
  +} from '@spotify-backstage/core';
  import ExampleFetchComponent from '../ExampleFetchComponent';
  -const useStyles = makeStyles<Theme>(theme => ({
  - mainContentArea: {
  - overflowX: 'hidden',
  - overflowY: 'auto',
  - },
  - pageBody: {
  - padding: theme.spacing(3),
  - },
  - title: {
  - padding: theme.spacing(1, 0, 2, 0),
  - },
  -}));
  -
  -const ExampleComponent: FC<{}> = () => {
  - const classes = useStyles();
  -
  - return (
  +const ExampleComponent: FC<{}> = () => (
  <Page theme={pageTheme.tool}>
  - <div className={classes.mainContentArea}>
  <Header title="Welcome to {{ id }}!" subtitle="Optional subtitle" />
  - <Grid
  - container
  - spacing={3}
  - direction="column"
  - className={classes.pageBody}
  - >
  + <Content>
  + <Grid container spacing={3} direction="column">
  <Grid item>
  <Typography variant="h3">Plugin page title</Typography>
  </Grid>
  @@ -45,9 +30,8 @@ const ExampleComponent: FC<{}> = () => {
  </InfoCard>
  </Grid>
  </Grid>
  - </div>
  + </Content>
  </Page>
  );
  -};
  export default ExampleComponent;
  