message: bump theme, remove styled-components dep
diff: "@docusaurus/core": "2.0.0-beta.3",
  "@docusaurus/preset-classic": "2.0.0-beta.3",
  "@ionic-internal/docusaurus-plugin-tag-manager": "2.0.0",
  - "@ionic-internal/docusaurus-theme": "2.0.20",
  + "@ionic-internal/docusaurus-theme": "3.0.0",
  "@ionic/prettier-config": "^1.0.1",
  "@ionic/react": "^5.6.8",
  "@mdx-js/react": "^1.6.22",
  "fs-extra": "^9.1.0",
  "remark-parse": "^8.0.3",
  "semver": "^7.3.5",
  - "styled-components": "^5.3.0",
  "typescript": "^4.3.2"
  }
  }
  