Remove preview of installation from generated docs

docs/docs/installation/index.html

@@ -135,18 +135,6 @@
 
 
 
-<ul class="td-sidebar-nav__section pr-md-3">
-  <li class="td-sidebar-nav__section-title">
-    <a  href="/kubernetes-operator/docs/installation/preview/" class="align-left pl-0 pr-2 td-sidebar-link td-sidebar-link__section">Installation - Preview</a>
-  </li>
-  <ul>
-    <li class="collapse show" id="kubernetes-operator-docs-installation-preview">
-      
-      
-      
-    </li>
-  </ul>
-</ul>
 
       
       

docs/docs/installation/preview/index.xml

@@ -1,23 +0,0 @@
-<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
-  <channel>
-    <title>Jenkins Operator – Installation - Preview</title>
-    <link>https://jenkinsci.github.io/kubernetes-operator/docs/installation/preview/</link>
-    <description>Recent Hugo news from gohugo.io</description>
-    <generator>Hugo -- gohugo.io</generator>
-    <lastBuildDate>Mon, 05 Oct 2020 00:00:00 +0000</lastBuildDate>
-    <image>
-      <url>https://jenkinsci.github.io/kubernetes-operator/img/hugo.png</url>
-      <title>GoHugo.io</title>
-      <link>https://jenkinsci.github.io/kubernetes-operator/docs/installation/preview/</link>
-    </image>
-    
-	  <atom:link href="https://jenkinsci.github.io/kubernetes-operator/docs/installation/preview/index.xml" rel="self" type="application/rss+xml" />
-    
-    
-      
-        
-      
-    
-    
-  </channel>
-</rss>