feat: add 404 page

client/src/app/app.routes.ts

@@ -6,7 +6,9 @@
 
 import { Routes } from "@angular/router";
 import { Home } from "./home/home.js";
+import { Soon } from "./soon/soon.js";
 
 export const routes: Routes = [
   { component: Home, path: "", pathMatch: "full" },
+  { component: Soon, path: "**" },
 ];