- added npm package dotenv-webpack for using env variables on clientside

- added API File Controller for downloading files e.g. /api/download/1022
- also create has codes by submitting new dataset
- added edit dataset functionalities for role submitter
- added the following route for role submitter: /dataset/:id/update', 'DatasetController.update'
- created extra UpdateDatasetValidator.ts for validating updated dataset
- npm updates

start/routes/api.ts

@@ -16,6 +16,8 @@ Route.group(() => {
         Route.get('/dataset/:publish_id', 'DatasetController.findOne').as('dataset.findOne');
         Route.get('/sitelinks/:year', 'HomeController.findDocumentsPerYear');
         Route.get('/years', 'HomeController.findYears');
+
+        Route.get('/download/:id', 'FileController.findOne').as('file.findOne');
     });
     // .middleware("auth:api");
 })