Create remote/server setup guide for Dreamhost

[perappu]

A necessary evil due to how much of the audience without a technical background prefers to use Dreamhost.

This should cover:

• Creating an account on Dreamhost and selecting a plan
• Setting up FTP and database users
• Logging in via SSH and adding an SSH key into authorized_keys
• Installing composer remotely
• Setting up git hooks
• Setting up the remote connection in SourceGit and pushing the code

.env file and email configuration are not included, and will instead be handled in #7