Fix docs menu titles and homepage jumbotron.

Rules

@@ -46,8 +46,8 @@ compile '*' do
     # don’t filter stylesheets
   elsif item.binary?
     # don’t filter binary items
-  elsif item[:title] == 'Home'
-    layout 'jumbotron'
+  elsif item[:layout]
+    layout item[:layout]
   else
     layout 'default'
   end

content/docs/querying/basics.md

 ---
 title: Querying basics
+nav_title: Basics
 sort_rank: 1
 ---
 

content/docs/querying/examples.md

 ---
 title: Querying examples
+nav_title: Examples
 sort_rank: 4
 ---
 

content/docs/querying/functions.md

 ---
 title: Query functions
+nav_title: Functions
 sort_rank: 3
 ---
 

content/index.html

+---
+layout: jumbotron
+---
 <div class="main">
   <div class="row">
     <div class="col-md-3">