refactor(navigation): 调整导航栏链接和图标

- 将"壁纸"链接替换为"瞬间"链接
- 移除 Twitter 导航项
- 删除多余的"瞬间"导航项

index.html

@@ -121,7 +121,7 @@
                                     <a href="https://nav.hehouhui.cn/"><span>导航</span><i></i></a>
                                 </li>
                                 <li class="navigation__item">
-                                    <a href="https://bing.wdbyte.com/"><span>壁纸</span><i></i></a>
+                                    <a href="javascript:void(0)" class="moments-link"><span>瞬间</span><i></i></a>
                                 </li>
                             </ul>
                         </nav>
@@ -149,13 +149,6 @@
                                         <span class="label">Twitter</span>
                                     </a>
                                 </li>
-                                <li class="navigation__item">
-                                    <a href="javascript:void(0)" class="moments-link"
-                                       title="瞬间" target="_blank">
-                                        <j class="fab fa-friend"></j>
-                                        <span class="label">瞬间</span>
-                                    </a>
-                                </li>
                                 <li class="navigation__item">
                                     <a onClick="weixin()" title="微信" target="_blank">
                                         <j class="fab fa-weixin"></j>