plugins.html.md: Unix dir packer.d -> .packer.d
plugins.html.md: Unix dir packer.d -> .packer.d

To match https://github.com/hashicorp/packer/blob/master/packer/config_file_unix.go#L7
rnaveiras/packer,bryson/packer,rnaveiras/packer,timsutton/packer,dave2/packer,grubernaut/packer,timsutton/packer,pecigonzalo/packer,pecigonzalo/packer,bryson/packer,ricardclau/packer,ricardclau/packer,bryson/packer,grubernaut/packer,grubernaut/packer,rnaveiras/packer,timsutton/packer,paulmey/packer,ricardclau/packer,pecigonzalo/packer,mitchellh/packer,ricardclau/packer,grubernaut/packer,paulmey/packer,timsutton/packer,paulmey/packer,ricardclau/packer,hashicorp/packer,hashicorp/packer,mitchellh/packer,dave2/packer,paulmey/packer,paulmey/packer,grubernaut/packer,rnaveiras/packer,timsutton/packer,mitchellh/packer,pecigonzalo/packer,dave2/packer,hashicorp/packer,ricardclau/packer,bryson/packer,dave2/packer,timsutton/packer,hashicorp/packer,bryson/packer,paulmey/packer,bryson/packer,dave2/packer,dave2/packer,mitchellh/packer,rnaveiras/packer,grubernaut/packer,mitchellh/packer,rnaveiras/packer