Web/_includes/nav/blognav.html

{% assign tag = page.tags[0] %}
{% assign posts = site.tags[tag] | where_exp: "post", "post.archived != true" %}
{% for post in posts %}
    {% if post.url != page.url %}
        {% continue %}
    {% endif %}
    {% if forloop.last == false %}
        {% assign prev = forloop.index0 | plus: 1 %}
    {% endif %}
    {% if forloop.first == false %}
        {% assign next = forloop.index0 | minus: 1 %}
    {% endif %}
    {% break %}
{% endfor %}

<a class="nav-item nav-link" href="../../#blog-{{ tag | slugify }}">🏠 Back to Main Page</a>
{% if prev %}
    <a class="nav-item nav-link" href="{{ posts[prev].url }}">⏮️ Previous in {{ tag }}</a>
{% endif %}
{% if next %}
    <a class="nav-item nav-link" href="{{ posts[next].url }}">⏭️ Next in {{ tag }}</a>
{% endif %}