message: remove depreacted docz theme.
diff: "@types/react": "16.9.15",
  "@types/react-dom": "16.9.4",
  "docz": "2.1.1",
  - "docz-theme-default": "1.2.0",
  "emotion-theming": "10.0.19",
  "react": "16.12.0",
  "react-dom": "16.12.0",
  