Fix about sidebar.

_data/nav.yml

@@ -75,12 +75,12 @@
     # - title: Approach
     - title: Icons
 
-# - title: About
-#   pages:
-#     - title: History
-#     - title: Team
-#     - title: Brand
-#     - title: License
-#     - title: Translations
+- title: About
+  pages:
+    - title: History
+    - title: Team
+    - title: Brand
+    - title: License
+    - title: Translations
 
 - title: Migration

docs/4.0/about/history.md

@@ -4,6 +4,7 @@ title: History
 description: A brief overview of the history of Bootstrap.
 redirect_from:
  - /about/
+group: about
 ---
 
 Originally created by a designer and a developer at Twitter, Bootstrap has become one of the most popular front-end frameworks and open source projects in the world.