frontend CHANGE simplify CSS files structure

keep just one global CSS file netopeer.css and then the specific
CSSs for the main components.
diff --git a/www/config/config.component.ts b/www/config/config.component.ts
index e658a2a..31768fb 100644
--- a/www/config/config.component.ts
+++ b/www/config/config.component.ts
@@ -1,9 +1,9 @@
 import { Component } from '@angular/core';
 
 @Component({
-  selector : 'netopeer-config',
-  templateUrl : './config.component.html',
-  styleUrls : ['../netopeer.content.css']
+    selector: 'netopeer-config',
+    templateUrl: './config.component.html',
+    styleUrls: ['../netopeer.css']
 })
 
 export class ConfigComponent {