fix assets design

src/app/app.component.html

 <div class='bottom'>
   <div class="d-flex flex-column flex-shrink-0 p-3 bg-light" style="width: 280px;">
     <a class="d-flex align-items-center mb-3 mb-md-0 me-md-auto link-dark text-decoration-none">
-      <img class="mclogo" src="https://event.ygobbs.com/Public/img/mycardlogo.png">
+      <img class="mclogo" src="./assets/mycardlogo.png">
       <span class="fs-4">MyCard | 排表器</span>
     </a>
     <hr>