feat: add a separate configuration field for site description (#672)

* Add an optional site description option

* Add site description to the example site (Chinese Auto-translated)

exampleSite/config.yaml

@@ -8,15 +8,18 @@ languages:
     en:
         languageName: English
         title: Example Site
+        description: Example description
         weight: 1
     zh-cn:
         languageName: 中文
         title: 演示站点
+        description: 演示说明
         weight: 2
     ar:
         languageName: عربي
         languagedirection: rtl
         title: موقع تجريبي
+        description: وصف تجريبي
         weight: 3
 
 # Change it to your Disqus shortname before using

layouts/partials/data/description.html

@@ -1,6 +1,11 @@
 <!-- Use site subtitle by default -->
 {{ $description := .Site.Params.sidebar.subtitle }}
 
+<!-- Seprate description exists -->
+{{ if .Site.Params.description }}
+    {{ $description = .Site.Params.description }}
+{{ end }}
+
 {{ if .Description }}
     <!-- Page description exists -->
     {{ $description = .Description }}