Implement Contributors Page & CTA in Header

[github-actions]

site/_includes/header.html

Line 12 in 782aa24

<!--- TODO: Implement Contributors Page & CTA in Header -->

<header style="display: flex; flex-direction: column; align-items: stretch;">
    <div style="display: flex; align-items: center; justify-content: space-between; width: 100%;">
        <a href="/" style="display: block;"><img src="/img/inverted_banner.svg" alt="CourseNotes" style="width: 300px; display: block;"></a>
        <!--- TODO: Implement Contributors Page & CTA in Header -->
        <!-- <nav>
            <ul style="margin: 0;">
                <li><a href="/helpus" class="helpus">Get Involved!</a></li>