chore: use "APPENV" to config environment

Author: maxceem

config/development.js renamed to config/dev.js

@@ -1,11 +1,11 @@
 /* global process */
 
 module.exports = (() => {
-  const env = process.env.NODE_ENV || "development";
+  const env = process.env.APPENV || "dev";
 
   // for security reason don't let to require any arbitrary file defined in process.env
-  if (["production", "development"].indexOf(env) < 0) {
-    return require("./development");
+  if (["prod", "dev"].indexOf(env) < 0) {
+    return require("./dev");
   }
 
   return require("./" + env);