message: create-app: remove duplicate techdocs plugin from app package
diff: "@backstage/plugin-lighthouse": "^{{version}}",
  "@backstage/plugin-tech-radar": "^{{version}}",
  "@backstage/plugin-github-actions": "^{{version}}",
  - "@backstage/plugin-techdocs": "^{{version}}",
  "@backstage/plugin-sentry": "^{{version}}",
  "@backstage/test-utils": "^{{version}}",
  "@backstage/theme": "^{{version}}",
  