feat(docs-infra): add Stack Overflow link to navigation social menu

Added Stack Overflow icon and link to the navigation component.

Author: erkamyaman

adev/src/app/core/layout/navigation/navigation.component.html

@@ -436,6 +436,29 @@
                 </svg>
               </a>
             </li>
+            <li>
+              <a
+                [href]="ngLinks.STACKOVERFLOW"
+                cdkMenuItem
+                title="Angular Stack Overflow"
+                target="_blank"
+                rel="noopener"
+              >
+                <!-- Stack Overflow Icon -->
+                <svg
+                  width="20"
+                  height="20"
+                  viewBox="0 0 120 120"
+                  fill="none"
+                  xmlns="http://www.w3.org/2000/svg"
+                >
+                  <path d="M84.4 93.8V70.6h7.7v30.9H22.6V70.6h7.7v23.2z" />
+                  <path
+                    d="M38.8 68.4l37.8 7.9 1.6-7.6-37.8-7.9-1.6 7.6zm5-18.1l35 16.3 3.2-7-35-16.4-3.2 7.1zm9.7-17.2l29.7 24.7 4.9-5.9-29.7-24.7-4.9 5.9zm19.2-18.3l-6.2 4.6 23 31 6.2-4.6-23-31zM38 86h38.6v-7.7H38V86z"
+                  />
+                </svg>
+              </a>
+            </li>
           </ul>
         </ng-template>
       </div>