jrtechs-cs224w-notes/_includes/header.html

<!--- Header and nav template site-wide -->
<header>
    <nav class="group">
    <a href="{{ site.baseurl }}/">Contents</a>
    <a href="http://cs224w.stanford.edu/">Class</a>
    <a href="https://github.com/snap-stanford/cs224w-notes">GitHub</a>
    </nav>
</header>