- add alias_url ind config/app.php

- Define constants DATACITE_PREFIX abd APP_URL inside wevpack.mix.js
- define subdomains for alias and dois inside routes/web.php
- install dotenv via npm

config/app.php

@@ -55,6 +55,7 @@ return [
      */
 
     'url' => env('APP_URL', 'http://localhost'),
+    'alias_url' => env('ALIAS_URL'),
 
     /*
     |--------------------------------------------------------------------------