source/journalist documentation

separates source and journalist user manual, updated for 0.3. updated readme.md. also updated full_install.md up the point of running the ansible-playbook. still need to merge that doc with install.md but wanted to discuss before doing so
I've never seen this before. Were you running on a Tails persistent USB when you were doing this? Note that we either need to running on a persistent Tails, or we need to provide an easy way to backup the resulting .onion addresses, ATHS auth tokens, and SSH keys when this process is done. Obviously I recommend creating a persistent "Admin Workstation USB", which is described in full_install.md.