add arch hook (#181)

diff --git a/content/_index.html b/content/_index.html
index e686575..a892480 100644
--- a/content/_index.html
+++ b/content/_index.html
@@ -18,42 +18,44 @@
 </div>
 {{< /blocks/cover >}}
 
-<div id="overview" class="bg-box">
-  <div class="contain" id="introduction">
-    <h1 class="section-head">What is SkyWalking?</h1>
-    <p>
-    SkyWalking is an Observability Analysis Platform and Application Performance Management system.
-    </p>
-      <p>Provide distributed tracing, service mesh telemetry analysis, metric aggregation and visualization all-in-one solution.</p>
-     <p>Java, .Net Core, PHP, NodeJS, Golang, LUA, C++ agents supported</p>
-     <p>Istio + Envoy Service Mesh supported</p>
+<div id="arch">
+    <div id="overview" class="bg-box">
+        <div class="contain" id="introduction">
+            <h1 class="section-head">What is SkyWalking?</h1>
+            <p>
+                SkyWalking is an Observability Analysis Platform and Application Performance Management system.
+            </p>
+            <p>Provide distributed tracing, service mesh telemetry analysis, metric aggregation and visualization all-in-one solution.</p>
+            <p>Java, .Net Core, PHP, NodeJS, Golang, LUA, C++ agents supported</p>
+            <p>Istio + Envoy Service Mesh supported</p>
 
-      <div class="swiper-container arch-swiper-container">
-          <div class="swiper-wrapper">
-              <div class="swiper-slide">
-                  <img src="/images/skywalking-arch-3800x1600.jpg" width="" alt="Cloud Native Computing Foundation" title="Cloud Native Computing Foundation">
+            <div class="swiper-container arch-swiper-container">
+                <div class="swiper-wrapper">
+                    <div class="swiper-slide">
+                        <img src="/images/skywalking-arch-3800x1600.jpg" width="" alt="Cloud Native Computing Foundation" title="Cloud Native Computing Foundation">
 
-              </div>
-              <div class="swiper-slide">
-                  <img src="/screenshots/8.0.0/dashboard-1-3800x1600.jpg" width="" alt="dashboard" title="dashboard">
-              </div>
-              <div class="swiper-slide">
-                  <img src="/screenshots/8.0.0/dashboard-2-3800x1600.jpg" width="" alt="dashboard" title="dashboard">
-              </div>
-              <div class="swiper-slide">
-                  <img src="/screenshots/8.0.0/topology_3800x1600.png" width="" alt="dashboard" title="dashboard">
-              </div>
-              <div class="swiper-slide">
-                  <img src="/screenshots/6.1.0/trace_3800x1600.png" width="" alt="dashboard" title="dashboard">
-              </div>
-          </div>
-          <div class="arch-swiper-pagination swiper-pagination"></div>
+                    </div>
+                    <div class="swiper-slide">
+                        <img src="/screenshots/8.0.0/dashboard-1-3800x1600.jpg" width="" alt="dashboard" title="dashboard">
+                    </div>
+                    <div class="swiper-slide">
+                        <img src="/screenshots/8.0.0/dashboard-2-3800x1600.jpg" width="" alt="dashboard" title="dashboard">
+                    </div>
+                    <div class="swiper-slide">
+                        <img src="/screenshots/8.0.0/topology_3800x1600.png" width="" alt="dashboard" title="dashboard">
+                    </div>
+                    <div class="swiper-slide">
+                        <img src="/screenshots/6.1.0/trace_3800x1600.png" width="" alt="dashboard" title="dashboard">
+                    </div>
+                </div>
+                <div class="arch-swiper-pagination swiper-pagination"></div>
 
-          <div class="arch-swiper-button-prev swiper-button-prev"></div>
-          <div class="arch-swiper-button-next swiper-button-next"></div>
+                <div class="arch-swiper-button-prev swiper-button-prev"></div>
+                <div class="arch-swiper-button-next swiper-button-next"></div>
 
-      </div>
-  </div>
+            </div>
+        </div>
+    </div>
 </div>
 
 <div id="demo">