Add meta descriptions for mempool and liquid

frontend/src/app/dashboard/dashboard.component.ts

@@ -69,6 +69,7 @@ export class DashboardComponent implements OnInit, OnDestroy, AfterViewInit {
   ngOnInit(): void {
     this.isLoadingWebSocket$ = this.stateService.isLoadingWebSocket$;
     this.seoService.resetTitle();
+    this.seoService.resetDescription();
     this.websocketService.want(['blocks', 'stats', 'mempool-blocks', 'live-2h-chart']);
     this.websocketService.startTrackRbfSummary();
     this.network$ = merge(of(''), this.stateService.networkChanged$);