fix(images): replace PNG images with WEBP format

.vitepress/theme/components/Footer.vue

@@ -28,7 +28,7 @@ const siteVersion = theme.value.siteVersion;
       </div>
       <div class="beian-info">
         <div class="beian-gongan">
-          <img src="/assets/images/beian.png" loading="eager" />
+          <img src="/assets/images/beian.webp" loading="eager" />
           <a href="https://beian.mps.gov.cn/#/query/webSearch?code=23020002230215" target="_blank"
             >黑公网安备23020002230215</a
           >

.vitepress/theme/layouts/Default.vue

@@ -158,7 +158,7 @@ onMounted(() => {
                 <h3>
                   {{ randomGreeting }}
                 </h3>
-                <img src="/assets/images/avatar_transparent.png" alt="" />
+                <img src="/assets/images/avatar_transparent.webp" alt="" />
                 <span></span>
               </div>
             </ClientOnly>