message: feat(techdocs): add sanitizer package
diff: "@material-ui/core": "^4.9.1",
  "@material-ui/icons": "^4.9.1",
  "@material-ui/lab": "4.0.0-alpha.45",
  + "@types/sanitize-html": "^1.23.3",
  "react": "^16.13.1",
  "react-dom": "^16.13.1",
  "react-router": "6.0.0-beta.0",
  "react-router-dom": "6.0.0-beta.0",
  - "react-use": "^14.2.0"
  + "react-use": "^14.2.0",
  + "sanitize-html": "^1.27.0"
  },
  "devDependencies": {
  "@backstage/cli": "^0.1.1-alpha.12",
  