Update v8 architecture.

docs/.vuepress/config.js

@@ -27,6 +27,7 @@ module.exports = {
         nav: [
           { text: "Home", link: "/" },
           { text: "Docs",  items: [
+            { text: '8.0.0', link: "https://github.com/apache/skywalking/tree/v8.0.0/docs"},
             { text: '7.0.0', link: "https://github.com/apache/skywalking/tree/v7.0.0/docs"},
             { text: '6.6.0', link: "https://github.com/apache/skywalking/tree/v6.6.0/docs"},
             { text: '6.5.0', link: "https://github.com/apache/skywalking/tree/v6.5.0/docs"},
@@ -75,6 +76,7 @@ module.exports = {
           { text: "主页", link: "/zh/" },
           { text: "文档",
             items: [
+              { text: '8.0.0', link: "https://github.com/apache/skywalking/tree/v8.0.0/docs"},
               { text: '7.0.0', link: "https://github.com/apache/skywalking/tree/v7.0.0/docs"},
               { text: '6.6.0', link: "https://github.com/apache/skywalking/tree/v6.6.0/docs"},
               { text: '6.5.0', link: "https://github.com/apache/skywalking/tree/v6.5.0/docs"},

docs/.vuepress/theme/layouts/Home.vue

@@ -26,7 +26,7 @@
         <div class="home-card-about tc">
           <h1>{{data.what.title}}</h1>
           <p v-for="i in data.what.content">{{i}}</p>
-          <img style="margin-top:20px;max-width:900px;box-shadow: 0 2px 5px #00000033;" src="/assets/frame.jpeg" width="100%">
+          <img style="margin-top:20px;max-width:900px;box-shadow: 0 2px 5px #00000033;" src="/assets/frame-v8.jpeg" width="100%">
         </div>
         <div class="home-card-feature">
           <h1 class="tc">{{data.feature.title}}</h1>