Fix docs site index page (#3868)

Author: thehowl

docs/content/page/index.en-us.md

@@ -2,6 +2,7 @@
 date: "2016-11-08T16:00:00+02:00"
 title: "Documentation"
 slug: "documentation"
+url: "/en-us/"
 weight: 10
 toc: true
 draft: false

docs/content/page/index.fr-fr.md

@@ -2,6 +2,7 @@
 date: "2017-08-23T09:00:00+02:00"
 title: "Documentation"
 slug: "documentation"
+url: "/fr-fr/"
 weight: 10
 toc: true
 draft: false
@@ -48,7 +49,7 @@ Le but de ce projet est de fournir de la manière la plus simple, la plus rapide
     - Migré
 - Notifications (courriel et web)
     - Lu
-    - Non lu 
+    - Non lu
     - Épinglé
 - Page d'exploration
     - Utilisateurs

docs/content/page/index.zh-cn.md

@@ -2,6 +2,7 @@
 date: "2016-11-08T16:00:00+02:00"
 title: "文档"
 slug: "documentation"
+url: "/zh-cn/"
 weight: 10
 toc: true
 draft: false

docs/content/page/index.zh-tw.md

@@ -2,6 +2,7 @@
 date: "2016-11-08T16:00:00+02:00"
 title: "文件"
 slug: "documentation"
+url: "/zh-tw/"
 weight: 10
 toc: true
 draft: false