- 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

app/Models/Description.ts

@@ -9,6 +9,11 @@ export default class Description extends BaseModel {
     public static timestamps = false;
     public static fillable: string[] = ['value', 'type', 'language'];
 
+    @column({
+        isPrimary: true,
+    })
+    public id: number;
+    
     @column({})
     public document_id: number;