feat: add product hunt banner (#2003)

docs/app/pages/home/banner/banner.component.ts

@@ -0,0 +1,63 @@
+/**
+ * @license
+ * Copyright Akveo. All Rights Reserved.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */
+
+import { Component, HostBinding, Inject, OnInit } from '@angular/core';
+import { NB_WINDOW } from '@nebular/theme';
+
+const HIDE_BANNER_KEY = 'HIDE_PRODUCT_HUNT_BANNER';
+
+@Component({
+  selector: 'ngx-release-banner',
+  template: `
+    <div class="heading-with-icon">
+      <img class="icon" src="/assets/img/product-hunt-cat.png" alt="Product Hunt">
+      <div class="banner-content">
+        <h2 class="banner-heading">ngx-admin is on Product Hunt today!</h2>
+        <p class="cta">Please
+          <a class="cta-link"
+             href="https://www.producthunt.com/posts/ngx-admin"
+             target="_blank">
+            share
+          </a>
+          your feedback :)
+        </p>
+      </div>
+      <button class="close-button" aria-label="close" (click)="closeBanner()">
+        <span class="nb-close"></span>
+      </button>
+    </div>
+  `,
+  styleUrls: ['./banner.component.scss'],
+})
+export class BannerComponent implements OnInit {
+
+  storage: Storage;
+
+  @HostBinding('attr.hidden')
+  isHidden: true | null = null;
+
+  @HostBinding('attr.dir')
+  dir = 'ltr';
+
+  constructor(
+    @Inject(NB_WINDOW) private window,
+  ) {}
+
+  ngOnInit() {
+    this.storage = this.window.localStorage;
+
+    this.isHidden = this.storage && this.storage.getItem(HIDE_BANNER_KEY)
+      ? true
+      : null;
+  }
+
+  closeBanner() {
+    if (this.storage) {
+      this.storage.setItem(HIDE_BANNER_KEY, 'true');
+    }
+    this.isHidden = true;
+  }
+}