Remove unused plugin

Author: jihchi

package.json

@@ -44,7 +44,6 @@
     "@jihchi/plugin-rescript": "0.0.0",
     "@snowpack/plugin-dotenv": "^2.1.0",
     "@snowpack/plugin-react-refresh": "^2.4.2",
-    "@snowpack/plugin-run-script": "^2.3.0",
     "@snowpack/web-test-runner-plugin": "^0.2.2",
     "@testing-library/react": "^11.2.6",
     "@web/test-runner": "^0.12.19",