fix override of landing page

{% extends "base.html" %}

{% extends "main.html" %}

{% block tabs %}

  {{ super() }}

  <style>.md-header{position:initial}.md-main__inner{margin:0}.md-content{display:none}@media screen and (min-width:60em){.md-sidebar--secondary{display:none}}@media screen and (min-width:76.25em){.md-sidebar--primary{display:none}}</style>