fix(router): fixing sub path refresh issue on gh-pages

Reference: Step 5. https://medium.com/swlh/how-to-host-your-angular-reactjs-vuejs-spa-on-github-pages-2d9ab102ac7b

angular.json

@@ -19,7 +19,8 @@
             "polyfills": "src/polyfills.ts",
             "assets": [
               "src/assets",
-              "src/pow.wasm"
+              "src/pow.wasm",
+              "src/404.html"
             ],
             "styles": [
               "src/styles.less"

src/404.html

@@ -0,0 +1,5 @@
+<script>
+    const path = window.location.pathname.slice(1);
+    localStorage.setItem('path', path);
+    window.location.href='../';
+</script>

src/app/app.component.ts

@@ -58,6 +58,11 @@ export class AppComponent implements OnInit {
     private ledger: LedgerService,
     public price: PriceService) { 
       router.events.subscribe(() => { this.navExpanded = false })
+      let path = localStorage.getItem('path');
+      if(path) {
+        localStorage.removeItem('path');
+        this.router.navigate([path]);
+      }
     }
 
   async ngOnInit() {