DEV: Remove default value from sections (#50)

This commit removes the default values from the `sections` theme setting
since they are too generic and are not good defaults. The defaults were
useful previously for the old `link_sections` and `links` theme settings
since there was an "implicit" format to follow and the defaults serve as
examples of the format. Now that `sections` is a objects type setting,
there is no need for us to provide any examples.

settings.yml

@@ -8,97 +8,7 @@ blurb:
 
 sections:
   type: objects
-  default:
-    - text: Design
-      title: Get inspired!
-      links:
-        - text: Design process
-          url: "#"
-          title: Learn the basics
-        - text: Blog design
-          url: "#"
-          title: What makes for a great blog?
-        - text: Photoshop tutorials
-          url: "#"
-          title: Photoshop for beginners
-        - text: Design trends
-          url: "#"
-          title: Stay on top of the current trends!
-    - text: Code
-      title: Learn new things!
-      links:
-        - text: Wordpress
-          url: "#"
-          title: Wordpress code examples
-        - text: Tools
-          url: "#"
-          title: Tools that will make your life easier!
-        - text: Tutorials
-          url: "#"
-          title: Just starting out? We'll guide you through the basics
-    - text: Business
-      title: Start a new career!
-      links:
-        - text: Blogging
-          url: "#"
-          title: Why not start a blog?
-        - text: Social media
-          url: "#"
-          title: Learn how to leverage Social media and make it work for your business
-        - text: Make money
-          url: "#"
-          title: Everyone likes to be paid!
-        - text: Marketing
-          url: "#"
-          title: No business will survive without customers...Here's how to get'em!
-    - text: Shop
-      title: Buy cool stuff!
-      links:
-        - text: Vectors
-          url: "#"
-          title: buy vectors
-        - text: Textures
-          url: "#"
-          title: buy textures
-        - text: UI kits
-          url: "#"
-          title: buy UI kits
-        - text: PSDs
-          url: "#"
-          title: Ready-made PSD's
-    - text: Community
-      title: The latest news about the people you care about!
-      links:
-        - text: Your corner
-          url: "#"
-          title: Tell us how you feel!
-        - text: Questions
-          url: "#"
-          title: Feel like answering some questions?
-        - text: Members
-          url: "#"
-          title: Say hi to new members
-        - text: trending
-          url: "#"
-          title: Catch up with the latest trending topics!
-    - text: World
-      title: Check out what's happening
-      links:
-        - text: Politics
-          url: "#"
-          title: Stay up to date
-        - text: Education
-          url: "#"
-          title: The latest research
-        - text: Automotive
-          url: "#"
-          title: We cover the latest models!
-        - text: Sports
-          url: "#"
-          title: The latest scores
-        - text: Tech
-          url: "#"
-          title: Never miss a new gadget
+  default: []
   schema:
     name: link section
     identifier: text