added jitsi api + improvements

src/app/pages/unavailable/unavailable.component.ts

@@ -1,5 +1,6 @@
 import {Component, OnInit} from '@angular/core';
-import { Location } from '@angular/common'
+import {Location} from '@angular/common'
+import {Router, ActivatedRoute} from '@angular/router';
 
 @Component({
   selector: 'app-unavailable',
@@ -7,14 +8,29 @@ import { Location } from '@angular/common'
 })
 export class UnavailableComponent implements OnInit {
 
+  targetRoute = '';
+
   constructor(
-    private location: Location) {}
+    private location: Location,
+    private router: Router,
+    private route: ActivatedRoute) {}
 
   ngOnInit(): void {
+    this.route.queryParams.subscribe(params => {
+      if(params['target']) {
+        this.targetRoute = params['target'];
+        this.router.navigate([], {queryParams: {target: null}, queryParamsHandling: 'merge'});
+      }
+    });
+
   }
 
   retry() {
-    this.location.back();
+    if(!this.targetRoute || this.targetRoute === "unavailable" || this.targetRoute === "/unavailable") {
+      this.location.back;
+    } else {
+      this.router.navigate([this.targetRoute]);
+    }
   }
 
 }