feat(aio): Add GitHub and Twitter external icon links to topnav toolbar

aio/src/app/app.component.html

@@ -27,6 +27,12 @@
     </a>
     <aio-top-menu *ngIf="isSideBySide" [nodes]="topMenuNodes"></aio-top-menu>
     <aio-search-box class="search-container" #searchBox (onSearch)="doSearch($event)" (onFocus)="doSearch($event)"></aio-search-box>
+    <div class="toolbar-external-icons-container">
+      <a  href="https://twitter.com/angular" title="Twitter">
+      <img src="assets/images/logos/twitter-icon.svg"></a>
+      <a  href="https://github.com/angular/angular" title="GitHub">
+        <img src="assets/images/logos/github-icon.svg"></a>
+    </div>
   </mat-toolbar-row>
 </mat-toolbar>
 

aio/src/app/app.module.ts

@@ -10,6 +10,7 @@ import { MatIconModule, MatIconRegistry } from '@angular/material/icon';
 import { MatProgressBarModule } from '@angular/material/progress-bar';
 import { MatSidenavModule } from '@angular/material/sidenav';
 import { MatToolbarModule } from '@angular/material/toolbar';
+import { MatTooltipModule } from '@angular/material/tooltip';
 
 import { AppComponent } from 'app/app.component';
 import { CustomIconRegistry, SVG_ICONS } from 'app/shared/custom-icon-registry';
@@ -97,6 +98,7 @@ export const svgIconProviders = [
     MatProgressBarModule,
     MatSidenavModule,
     MatToolbarModule,
+    MatTooltipModule,
     SwUpdatesModule,
     SharedModule,
   ],

aio/src/assets/images/logos/github-icon.svg

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 22.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 51.8 50.4" style="enable-background:new 0 0 51.8 50.4;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#FFFFFF;}
+</style>
+<path class="st0" d="M25.9,0.2C11.8,0.2,0.3,11.7,0.3,25.8c0,11.3,7.3,20.9,17.5,24.3c1.3,0.2,1.7-0.6,1.7-1.2c0-0.6,0-2.6,0-4.8
+	c-7.1,1.5-8.6-3-8.6-3c-1.2-3-2.8-3.7-2.8-3.7c-2.3-1.6,0.2-1.6,0.2-1.6c2.6,0.2,3.9,2.6,3.9,2.6c2.3,3.9,6,2.8,7.5,2.1
+	c0.2-1.7,0.9-2.8,1.6-3.4c-5.7-0.6-11.7-2.8-11.7-12.7c0-2.8,1-5.1,2.6-6.9c-0.3-0.7-1.1-3.3,0.3-6.8c0,0,2.1-0.7,7,2.6
+	c2-0.6,4.2-0.9,6.4-0.9c2.2,0,4.4,0.3,6.4,0.9c4.9-3.3,7-2.6,7-2.6c1.4,3.5,0.5,6.1,0.3,6.8c1.6,1.8,2.6,4.1,2.6,6.9
+	c0,9.8-6,12-11.7,12.6c0.9,0.8,1.7,2.4,1.7,4.7c0,3.4,0,6.2,0,7c0,0.7,0.5,1.5,1.8,1.2c10.2-3.4,17.5-13,17.5-24.3
+	C51.5,11.7,40.1,0.2,25.9,0.2z"/>
+</svg>

aio/src/assets/images/logos/twitter-icon.svg

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 22.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 50 49.7" style="enable-background:new 0 0 50 49.7;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#FFFFFF;}
+</style>
+<path class="st0" d="M50,9.3c-1.8,0.8-3.8,1.4-5.9,1.6c2.1-1.3,3.7-3.3,4.5-5.7c-2,1.2-4.2,2-6.5,2.5c-1.9-2-4.5-3.2-7.5-3.2
+	c-5.7,0-10.3,4.6-10.3,10.3c0,0.8,0.1,1.6,0.3,2.3C16.1,16.7,8.5,12.6,3.5,6.4c-0.9,1.5-1.4,3.3-1.4,5.2c0,3.6,1.8,6.7,4.6,8.5
+	C5,20,3.4,19.6,2,18.8c0,0,0,0.1,0,0.1c0,5,3.5,9.1,8.2,10.1c-0.9,0.2-1.8,0.4-2.7,0.4c-0.7,0-1.3-0.1-1.9-0.2
+	c1.3,4.1,5.1,7,9.6,7.1c-3.5,2.8-7.9,4.4-12.7,4.4c-0.8,0-1.6,0-2.4-0.1c4.5,2.9,9.9,4.6,15.7,4.6c18.9,0,29.2-15.6,29.2-29.2
+	c0-0.4,0-0.9,0-1.3C46.9,13.2,48.6,11.4,50,9.3z"/>
+</svg>

aio/src/styles/1-layouts/_top-menu.scss

@@ -196,3 +196,25 @@ aio-search-box.search-container {
     }
   }
 }
+
+// EXTERNAL LINK ICONS
+.app-toolbar {
+    .toolbar-external-icons-container {
+      display: flex;
+      flex-direction: row;
+
+      a {
+        display: flex;
+        align-items: center;
+        margin-left: 16px;
+
+        &:hover {
+          opacity: 0.8;
+        }
+
+        img {
+          height: 24px;
+        }
+      }
+    }
+}