Add a new guide on the docs page. (#723)

themes/docsy/layouts/docs/baseof.html

@@ -15,8 +15,10 @@
           <main role="main">
             <h1 class="text-center">Projects and Documentation</h1>
             <p class="article-description mt-4">
-              This directory includes the official SkyWalking repositories and some ecosystem projects developed by the community. Looking for downloadable releases? You can find them in the
-              <a href="/downloads">Downloads</a> page.
+              SkyWalking consists of the Server, UI, native storage, and various agents.<br/>
+              You can start by exploring the <a href="#SkyWalking">SkyWalking Server documentation</a> to understand the system's installation and deployment methods,<br/>
+              and then choose the necessary agents and integrations.<br/>
+              If you want to deploy a feature preview directly, you can follow the <a href="#SkyWalkingShowcase">showcase documentation</a> for a quick deployment.
             </p>
             <div class="text-center btn-wrapper mb-4">
               {{range .Site.Data.docs}}