move to playbooks subdir

diff --git a/ch04/Vagrantfile b/ch04/playbooks/Vagrantfile
similarity index 100%
rename from ch04/Vagrantfile
rename to ch04/playbooks/Vagrantfile

diff --git a/ch04/ansible.cfg b/ch04/playbooks/ansible.cfg
similarity index 100%
rename from ch04/ansible.cfg
rename to ch04/playbooks/ansible.cfg

diff --git a/ch04/greet.yml b/ch04/playbooks/greet.yml
similarity index 100%
rename from ch04/greet.yml
rename to ch04/playbooks/greet.yml

diff --git a/ch04/greetvars.yml b/ch04/playbooks/greetvars.yml
similarity index 100%
rename from ch04/greetvars.yml
rename to ch04/playbooks/greetvars.yml

diff --git a/ch04/install-package.yml b/ch04/playbooks/install-package.yml
similarity index 100%
rename from ch04/install-package.yml
rename to ch04/playbooks/install-package.yml

diff --git a/ch04/inventory b/ch04/playbooks/inventory
similarity index 100%
rename from ch04/inventory
rename to ch04/playbooks/inventory

diff --git a/ch04/localfact.yml b/ch04/playbooks/localfact.yml
similarity index 100%
rename from ch04/localfact.yml
rename to ch04/playbooks/localfact.yml

diff --git a/ch04/playbook.yml b/ch04/playbooks/playbook.yml
similarity index 100%
rename from ch04/playbook.yml
rename to ch04/playbooks/playbook.yml

diff --git a/ch04/update-cache.yml b/ch04/playbooks/update-cache.yml
similarity index 100%
rename from ch04/update-cache.yml
rename to ch04/playbooks/update-cache.yml

diff --git a/ch04/whoami.yml b/ch04/playbooks/whoami.yml
similarity index 100%
rename from ch04/whoami.yml
rename to ch04/playbooks/whoami.yml