change default state of sidebar (#101)

src/app/core/shell/shell.component.ts

@@ -23,6 +23,7 @@ export class ShellComponent implements OnInit {
               private progressBarService: ProgressBarService) { }
 
   ngOnInit() {
+    this.sidenavCollapsed = true;
     this.progressBarService.updateProgressBar.subscribe((mode: string) => {
       this.progressBarMode = mode;
     });

src/app/core/shell/toolbar/toolbar.component.ts

@@ -40,6 +40,7 @@ export class ToolbarComponent implements OnInit {
   constructor(private breakpointObserver: BreakpointObserver) { }
 
   ngOnInit() {
+    this.sidenavCollapsed = !this.sidenavCollapsed;
     this.isHandset$.subscribe(isHandset => {
       this.isHandset = isHandset;
     });