Updating _config_dev.yml to match changes to root and repo vars

_config_dev.yml

 #------------------------------------------------------------
-# This config-file is only needed for development. Instead of changing
-# the url everytime you work locally on the project, run a server with
+# This config file is only needed for development. Instead of changing
+# the URL everytime you work locally on the project, run a server with
 # both configuration files:
 #
 #    jekyll serve --config _config.yml,_config_dev.yml
 #------------------------------------------------------------
 
-# Is this production or development? (Overrides _config.yml.)
-is_production: false
-
-# Override root so that CSS and other resources will load locally.
-github:
-  url: http://0.0.0.0:4000
+root: http://localhost:4000