Extended documentation on rsync-approach. It also mentions rrsync wrapper script which restricts access for rsync to the server. Based on my blog post here: http://vrepin.org/vr/JekyllDeploy/
Restored previous version of 'Rsync' section and renamed it to 'scp' to reflect the content
Misspelling corrected: authorized_keys, not auhorized_key
According to /site/_data/docs.yml, the document next to
'deployment-methods' is 'continuous-integration', not 'troubleshooting'
(the 'prev_section' value in 'troubleshooting' is correctly set to
'deployment-methods' though).