feat: add github repo link as oct-cat

Author: Yu0614

src/app/app.component.html

@@ -309,6 +309,7 @@
     <span style="margin-left: 1.5vw" [routerLink]="['/reactive']" routerLinkActive="router-link-active"> REACTIVE </span>
     <span style="margin-left: 1.5vw" [routerLink]="['/template-driven']" routerLinkActive="router-link-active"> TEMPLATE DRIVEN </span>
     <div class="spacer"></div>
+    <!-- twitter -->
     <a aria-label="Angular on twitter" target="_blank" rel="noopener" href="https://twitter.com/angular" title="Twitter">
         <svg id="twitter-logo" height="24" data-name="Logo" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400">
             <rect width="400" height="400" fill="none" />
@@ -318,6 +319,18 @@
             />
         </svg>
     </a>
+    <!-- twitter -->
+    <!-- Github -->
+    <a
+        aria-label="Github repo link"
+        target="_blank"
+        rel="noopener"
+        href="https://github.com/Yu0614/angular-form-differences"
+        title="Github repo link"
+    >
+        <img src="../assets/github-octcat.png" alt="github" style="width: 30px; height: 30px" />
+    </a>
+    <!-- Github -->
 </div>
 
 <ng-container *ngIf="currentRoute === '/'">