fix indent on video block

Author: Arhell

content/ko/_index.html

@@ -41,7 +41,6 @@ <h2>150+ 마이크로서비스를 쿠버네티스로 마이그레이션하는 
         <button id="desktopShowVideoButton" onclick="kub.showVideo()">Watch Video</button>
         <br>
         <br>
-        <br>
         <a href="https://events.linuxfoundation.org/kubecon-cloudnativecon-europe/?utm_source=kubernetes.io&utm_medium=nav&utm_campaign=kccnceu20" button id="desktopKCButton">Attend KubeCon in Amsterdam on August 13-16, 2020</a>
         <br>
         <br>