Set og:image meta for seo by default on all pages

_config.yml

@@ -22,7 +22,14 @@ plugins:
 defaults:
   - scope:
       path: ""
+      type: pages
+    values:
+      layout: default
+      image: /images/social/elixir-og-card.jpg
+  - scope:
+      path: "posts"
       type: posts
     values:
       layout: post
       permalink: /blog/:year/:month/:day/:title/
+      image: /images/social/elixir-og-card.jpg

_layouts/blog.html

@@ -7,7 +7,7 @@
 <div id="sidebar-primary" class="sidebar">
   {% include search.html %}
   <div class="rss-button">
-    <a href="https://elixir-lang.org/atom.xml" target="_blank"><img src="/images/social/RSSButton.png" alt="RSS button" /></a>
+    <a href="https://elixir-lang.org/atom.xml" target="_blank"><img src="/images/social/rss-feed-icon.svg" alt="RSS button" width="32" /></a>
   </div>
   {% include categories-list.html %}
   {% include important-links.html %}

cases.html

@@ -1,6 +1,5 @@
 ---
 section: cases
-layout: default
 ---
 
 <h1>Cases</h1>

index.html

@@ -1,6 +1,5 @@
 ---
 section: home
-layout: default
 ---
 
 <div class="hfeed">