Upload Ghost override data (themes etc)

Upload a Ghost 'override' directory using `rsync`, useful for adding
custom themes and configuration to Ghost.
Add stock Ghost config.example.js

Add the stock configuration file for Ghost, copied from:
https://raw.githubusercontent.com/TryGhost/Ghost/e6abe9bab76d1c76d57b586204017ad7606b46dd/config.example.js
Rename example configuration file

Rename config.example.js to config.js ready for use.
Customise Ghost configuration

Customise Ghost configuration:
  - Set blog URL
  - Set Ghost to listen on all available network interfaces