Remove aws s3 sync from build script.

* Having the aws s3 command on Snap's config for gh-pages.

Rakefile

@@ -1,13 +1,6 @@
 require 'middleman-gh-pages'
 require 'rake/clean'
-require_relative "lib/version"
 
 CLOBBER.include('build')
 
 task :default => [:build]
-
-task :publish do
-  sh("aws s3 sync 'build' s3://#{ENV['S3_BUCKET']} --dryrun --cache-control 'max-age=600' --acl public-read")
-end
-
-Rake::Task[:publish].prerequisites.unshift "clobber"