Update index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset='utf-8'>
    <meta http-equiv="X-UA-Compatible" content="chrome=1">

    <link rel="stylesheet" href="stylesheets/stylesheet.css">
    <link rel="stylesheet" href="stylesheets/pygment_trac.css">
    <link rel="stylesheet" href="stylesheets/custom.css">