Show blog post count locally

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

app/config/sculpin_site.yml

@@ -36,6 +36,7 @@ drupalorg:
 
 features:
   new_css: false
+  show_blog_post_count: true
 
 github:
   url: https://github.com/%github.username%

source/_pages/blog.html.twig

@@ -7,6 +7,10 @@ pagination:
 use: [posts]
 ---
 
+{% if site.features.show_blog_post_count %}
+  {{ data.posts|length|number_format }}
+{% endif %}
+
 <ul>
   {% for post in page.pagination.items %}
     <li>