Support configuring the featured series in the _config.yml

Author: rtyler

_config.yml

@@ -7,6 +7,7 @@ description: >- # this means to ignore newlines until "baseurl:"
 baseurl: "" # the subpath of your site, e.g. /blog
 url: "https://tech.scribd.com" # the base hostname & protocol for your site, e.g. http://example.com
 google_analytics: 'UA-443684-30'
+featured_series: 'airflow-series'
 
 # GitHub Metadata
 # Used for "improve this page" link

_includes/featured-post-hero.html

@@ -70,9 +70,8 @@ <h2 class="hero__title">
             <section class="feat-post__secondary">
                 <h3 class="section-heading mb-0 text-plum">Featured Series</h3>
                 <ul class="post-list text-length-sm">
-
                     <!-- Pick a series to features using its unique tag - i.e. di-series -->
-                    {% assign featured-series = site.tags.di-series | sort: 'date' %}
+                    {% assign featured-series = site.tags[site.featured_series] | sort: 'date' %}
                     {% for post in featured-series limit: 2 %}
                         <!-- Post item template -->
                         {% include post-list-item.html %}