<tr>
    <td>
        {% if member.image_url %}<img class="profile" src="{{member.image_url}}" alt="{{member.name}}'s picture">{% endif %}
    </td>
    <td class="member">
        <h3 style="margin:0">{{ member.name }}</h3>
        <span>{% if member.github %}<img class="icon" src="/assets/github-circle.png"><a href="https://github.com/@{{member.github}}">@{{member.github}}</a>{% endif %}<span></span><span>{% if member.website %}<img class="icon" src="/assets/link-variant.png"><a href="{{member.website}}">{{member.website}}</a>{% endif %}</span>
        <p>{{member.short_bio}}</p>
    </td>
</tr>
<tr>
    <td>
        {% if member.image_url %}<img class="profile" src="{{member.image_url}}" alt="{{member.name}}'s picture">{% endif %}
    </td>
    <td class="member">
        <h3 style="margin:0">{{ member.name }}</h3>
        <span>{% if member.github %}<img class="icon" src="/assets/github-circle.png"><a href="https://github.com/{{member.github}}">@{{member.github}}</a>{% endif %}<span></span><span>{% if member.website %}<img class="icon" src="/assets/link-variant.png"><a href="{{member.website}}">{{member.website}}</a>{% endif %}</span>
        <p>{{member.short_bio}}</p>
    </td>
</tr>

Remove @ from github link
Remove @ from github link