Add demo video link to usage component

Author: austenstone

src/app/components/usage/usage.component.html

@@ -103,11 +103,17 @@ <h1 class="mat-headline-2" style="user-select: none; font-weight: 800; text-alig
       <mat-icon svgIcon="github"></mat-icon>
       Download your GitHub usage report
     </button>
+    <a href="https://youtu.be/VSrB4Qhqgs8" target="_blank">
+      <button mat-button color="accent" style="margin-top: 40px;">
+        <mat-icon>video_library</mat-icon>
+        Watch Demo
+      </button>
+    </a>
     <a href="https://github.com/austenstone/github-actions-usage-report" target="_blank">
       <button mat-button color="accent" style="margin-top: 40px;">
         <mat-icon>code</mat-icon>
         Source Code
       </button>
     </a>
   </div>
-</ng-container>
+</ng-container>