templates/base: Improve social media title

templates/base.html

@@ -6,9 +6,11 @@
     <meta name="viewport" content="width=device-width,minimum-scale=1" />
     <title>
       {%- block title -%}
-      {% set title = page.title | default(value=section.title) -%}
-      {% if title != config.title -%}
-      {% set title = title ~ ' | ' ~ config.title -%}
+      {% set page_title = page.title | default(value=section.title) -%}
+      {% if page_title == config.title -%}
+      {% set title = page_title -%}
+      {% else -%}
+      {% set title = page_title ~ ' | ' ~ config.title -%}
       {% endif -%}
       {% set description = page.summary | default(value=config.description) | striptags | split(pat='.
 ') | first | replace(from='
@@ -27,7 +29,7 @@
       title="{{ config.title }}"
     />
     {% if current_url -%}
-    <meta property="og:title" content="{{ title }}" />
+    <meta property="og:title" content="{{ page_title }}" />
     <meta name="description" content="{{ description }}" />
     <meta property="og:description" content="{{ description }}" />
     <meta property="og:url" content="{{ current_url | safe }}" />