major updates across the theme to make it more user-centered

pages/single-sourcing/build_arguments.md

@@ -3,7 +3,11 @@ title: Build arguments
 permalink: /build_arguments/
 tags: [single-sourcing, publishing]
 audience: writer, designer
+keywords: 
+last_updated: 
+summary: 
 ---
+{% include linkrefs.html %} 
 
 ## How to build Jekyll sites
 

pages/single-sourcing/conditional_logic.md

@@ -3,7 +3,12 @@ title: Conditional logic
 permalink: /conditional_logic/
 tags: single-sourcing
 audience: writer, designer
+keywords: 
+last_updated: 
+summary: 
 ---
+{% include linkrefs.html %} 
+
 If you want to create different outputs for different audiences, you can do all of this using a combination of Jekyll's Liquid markup and values in your configuration file.
 
 {{tip}} Definitely check out [Liquid's documentation](http://docs.shopify.com/themes/liquid-documentation/basics) for more details about how to use operators and other liquid markup. The notes here are a small, somewhat superficial sample from the site.{{end}}

pages/single-sourcing/content_reuse.md

@@ -3,7 +3,11 @@ title: Content reuse
 permalink: /content_reuse/
 tags: single-sourcing
 audience: writer, designer
+keywords: 
+last_updated: 
+summary: 
 ---
+{% include linkrefs.html %} 
 
 You can embed content from one file inside another using includes. Put the file containing content you want to reuse (e.g., mypage.html) inside the _includes folder, and then use a tag like this:
 

pages/single-sourcing/excluding_files.md

@@ -3,7 +3,11 @@ title: Excluding files and folders
 permalink: /excluding_files/
 tags: single-sourcing
 audience: writer, designer
+keywords: 
+last_updated: 
+summary: 
 ---
+{% include linkrefs.html %} 
 
 By default, all files in your project are included in your output. To exclude files, note them in the `exclude` section in the configuration file. Here's a sample: