fix(@schematics/angular): add twitter link icon (#15385)

* fix(@schematics/angular): add twitter link icon

* fix(@schematics/angular): remove height unit

Author: sjtrimble

packages/schematics/angular/application/other-files/app.component.html.template

@@ -30,6 +30,10 @@
     margin: 0;
   }
 
+  .spacer {
+    flex: 1;
+  }
+
   .toolbar {
     height: 60px;
     margin: -8px;
@@ -44,6 +48,15 @@
     margin: 0 16px;
   }
 
+  .toolbar #twitter-logo {
+    height: 40px;
+    margin: 0 16px;
+  }
+
+  .toolbar #twitter-logo:hover {
+    opacity: 0.8;
+  }
+
   .content {
     display: flex;
     margin: 32px auto;
@@ -290,6 +303,27 @@
     src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNTAgMjUwIj4KICAgIDxwYXRoIGZpbGw9IiNERDAwMzEiIGQ9Ik0xMjUgMzBMMzEuOSA2My4ybDE0LjIgMTIzLjFMMTI1IDIzMGw3OC45LTQzLjcgMTQuMi0xMjMuMXoiIC8+CiAgICA8cGF0aCBmaWxsPSIjQzMwMDJGIiBkPSJNMTI1IDMwdjIyLjItLjFWMjMwbDc4LjktNDMuNyAxNC4yLTEyMy4xTDEyNSAzMHoiIC8+CiAgICA8cGF0aCAgZmlsbD0iI0ZGRkZGRiIgZD0iTTEyNSA1Mi4xTDY2LjggMTgyLjZoMjEuN2wxMS43LTI5LjJoNDkuNGwxMS43IDI5LjJIMTgzTDEyNSA1Mi4xem0xNyA4My4zaC0zNGwxNy00MC45IDE3IDQwLjl6IiAvPgogIDwvc3ZnPg=="
   />
   <span>Welcome</span>
+    <div class="spacer"></div>
+  <a aria-label="Angular on twitter" href="https://twitter.com/angular" title="Twitter">
+    
+    <svg id="twitter-logo" height="24" data-name="Logo — FIXED" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400">
+      <defs>
+        <style>
+          .cls-1 {
+            fill: none;
+          }
+
+          .cls-2 {
+            fill: #ffffff;
+          }
+        </style>
+      </defs>
+      <rect class="cls-1" width="400" height="400" />
+      <path class="cls-2" d="M153.62,301.59c94.34,0,145.94-78.16,145.94-145.94,0-2.22,0-4.43-.15-6.63A104.36,104.36,0,0,0,325,122.47a102.38,102.38,0,0,1-29.46,8.07,51.47,51.47,0,0,0,22.55-28.37,102.79,102.79,0,0,1-32.57,12.45,51.34,51.34,0,0,0-87.41,46.78A145.62,145.62,0,0,1,92.4,107.81a51.33,51.33,0,0,0,15.88,68.47A50.91,50.91,0,0,1,85,169.86c0,.21,0,.43,0,.65a51.31,51.31,0,0,0,41.15,50.28,51.21,51.21,0,0,1-23.16.88,51.35,51.35,0,0,0,47.92,35.62,102.92,102.92,0,0,1-63.7,22A104.41,104.41,0,0,1,75,278.55a145.21,145.21,0,0,0,78.62,23"
+      />
+    </svg>
+    
+  </a>
 </div>
 
 <div class="content" role="main">