Create main NGINX configuration and directory to specifc configs

* Helps setup top-level configuration (which returns 403 when access
  is attempted), but also creates `/etc/nginx/configurations`, which
  can be used to configure specific sites or without conflicts.
Add NGINX configuration step to staticsite deployment, centrlize vars

* Renamed `staticsite` role to `staticsite-base`, since it handles
  git checkout and cleanup
* NGINX configuration uses deploy path variable, so the variable can't
  be role-specific
* Updated bootstrapper to configure NGINX as well.
Use vagrant-hostmanager plugin to allow access to specific sites

* https://github.com/smdahlen/vagrant-hostmanager
* Useful when the server is used for multiple sites