Change behavior if we do on don't have a github repository set up

[w4kpm]

right now, with the changes for the github sync & changes to the file sync between systems, we are assuming that you will have a github repository and that this is the same repository as the remote system.

In some cases we may not want to have a remote github repository - so the behavior should be a bit different

• never show the sync to github button if we don't have the environment variables set up
• don't impede the file sync from a remote box if we do not have github set up.

[cullerton]

With the new Git integration, this ticket can be closed.