add npm scripts -- serve:plugin, build:plugin

package.json

@@ -30,7 +30,8 @@
     "start": "nx start",
     "serve": "nx serve remix-ide --configuration=development",
     "serve:hot": "nx serve remix-ide --configuration=hot",
-    "serve:learneth": "nx serve learneth --configuration=development",
+    "serve:plugin": "nx serve ${npm_config_plugin} --configuration=development",
+    "build:plugin": "NODE_ENV=production nx build ${npm_config_plugin} --configuration=production --skip-nx-cache",
     "build": "nx build",
     "test": "nx test",
     "lint": "nx lint",