Change github repo url to https://github.com/danbooru/danbooru.

The danbooru repo was moved to https://github.com/danbooru.

config/danbooru_default_config.rb

@@ -47,7 +47,7 @@ module Danbooru
     end
 
     def source_code_url
-      "https://github.com/r888888888/danbooru"
+      "https://github.com/danbooru/danbooru"
     end
 
     def commit_url(hash)

config/deploy.rb

@@ -1,7 +1,7 @@
 set :stages, %w(production development staging)
 set :default_stage, "staging"
 set :application, "danbooru"
-set :repo_url,  "git://github.com/r888888888/danbooru.git"
+set :repo_url,  "git://github.com/danbooru/danbooru.git"
 set :deploy_to, "/var/www/danbooru2"
 append :linked_dirs, "log", "tmp/pids", "tmp/cache", "tmp/sockets", "vendor/bundle"
 set :branch, ENV.fetch("branch", "master")