activeadmin: fix title

activeadmin.md

@@ -1,72 +1,97 @@
+---
 title: ActiveAdmin
 category: Ruby
+layout: 2017/sheet
 ---
 
 ### Listing scopes
 
 Allows you to filter listings by a certain scope.
+{: .-setup}
 
+```ruby
 scope :draft
 scope :for_approval
+```
 
+```ruby
 scope :public, if: ->{ current_admin_user.can?(...) }
 scope "Unapproved", :pending
 scope("Published") { |books| books.where(:published: true) }
+```
 
 ### Sidebar filters
 
+```ruby
 filter :email
 filter :username
+```
 
 ### Custom actions
 
 You can define custom actions for models.
+{: .-setup}
 
+```ruby
 before_filter only: [:show, :edit, :publish] do
   @post = Post.find(params[:id])
 end
+```
 
-Make the route:
+#### Make the route
 
+```ruby
 member_action :publish, method: :put do
   @post.publish!
   redirect_to admin_posts_path, notice: "The post '#{@post}' has been published!"
 end
+```
 
-Link it in the index:
+#### Link it in the index
 
+```ruby
 index do
   column do |post|
     link_to 'Publish', publish_admin_post_path(post), method: :put
   end
 end
+```
 
-And link it in show/edit:
+#### And link it in show/edit
 
+```ruby
 action_item only: [:edit, :show] do
   @post = Post.find(params[:id])
   link_to 'Publish', publish_admin_post_path(post), method: :put
 end
+```
 
 ### Columns
 
+```ruby
 column :foo
+```
 
+```ruby
 column :title, sortable: :name do |post|
   strong post.title
 end
+```
 
 ### Other helpers
 
-    # Grey, green, orange, red
-    status_tag "Done"
-    status_tag "Finished", :ok
-    status_tag "You", :warn
-    status_tag "Failed", :error
+```ruby
+status_tag "Done"           # Gray
+status_tag "Finished", :ok  # Green
+status_tag "You", :warn     # Orange
+status_tag "Failed", :error # Red
+```
 
 ### Disabling 'new post'
 
+```ruby
 ActiveAdmin.register Post do
   actions :index, :edit
   # or: config.clear_action_items!
 end
+```