Added support for font variants in social plugin

Author: squidfunk

Diff for: docs/plugins/social.md

@@ -420,6 +420,7 @@ defining which parts of your layout can be parametrized. The [`default` layouts]
 - [`background_image`][option.background_image]
 - [`color`][option.color]
 - [`font_family`][option.font_family]
+- [`font_variant`][option.font_variant]
 - [`logo`][option.logo]
 - [`title`][option.title]
 - [`description`][option.description]
@@ -979,6 +980,29 @@ no further configuration needed.
 
 ---
 
+#### <!-- md:setting option.font_variant -->
+
+<!-- md:sponsors -->
+<!-- md:version insiders-4.53.3 -->
+<!-- md:default none -->
+
+Use this option to change the font variant used to generate the social card.
+If the downloaded font has variants like `Condensed` or `Expanded`, you can set
+them with:
+
+``` yaml
+plugins:
+  - social:
+      cards_layout_options:
+        font_variant: Condensed
+```
+
+The variant is combined with the style as used in the custom layout, so the
+plugin is instructed to use combinations like `Condensed Regular` or
+`Expanded Bold`.
+
+---
+
 #### <!-- md:setting option.logo -->
 
 <!-- md:sponsors -->