message: remove crontab guru link
diff: * under the License.
  */
  import React, { useState, useCallback, useRef, FunctionComponent } from 'react';
  -import { styled, t, useTheme } from '@superset-ui/core';
  +import { t, useTheme } from '@superset-ui/core';
  import { Input, AntdInput } from 'src/common/components';
  import { Radio } from 'src/common/components/Radio';
  import { CronPicker, CronError } from 'src/common/components/CronPicker';
  import { StyledInputContainer } from '../AlertReportModal';
  -const HelperText = styled.div`
  - display: block;
  - color: ${({ theme }) => theme.colors.grayscale.base};
  - font-size: ${({ theme }) => theme.typography.sizes.s - 1}px;
  - text-align: left;
  -`;
  interface AlertReportCronSchedulerProps {
  value: string;
  onChange: (change: string) => any;
  @@ -92,17 +86,6 @@ export const AlertReportCronScheduler: FunctionComponent<AlertReportCronSchedule
  </div>
  </StyledInputContainer>
  </div>
  - <HelperText>
  - {t('Refer to the ')}
  - <a
  - href="https://crontab.guru/"
  - target="_blank"
  - rel="noopener noreferrer"
  - >
  - {t('crontab guru')}
  - </a>
  - {t(' for more information on how to structure your CRON schedule.')}
  - </HelperText>
  </Radio.Group>
  </>
  );
  