add clean script

packages/micromark-extension-gfm-table/package.json

@@ -58,6 +58,7 @@
   },
   "scripts": {
     "build": "rimraf \"dev/**/*.d.ts\" \"test/**/*.d.ts\" && tsc && type-coverage && micromark-build",
+    "clean": "npx -y shx rm -rf lib index.js index.d.ts \"dev/**/*.d.ts\" \"test/**/*.d.ts\"",
     "test-api": "node --conditions development test/index.js",
     "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov node --conditions development test/index.js",
     "test": "npm run build && npm run format && npm run test-coverage",