delete image commands and distro CLI

* delete dead code
* delete configuration.go and move buildpacks, invokers, and manifests into
  main.go

Author: glyn

Makefile

@@ -23,13 +23,11 @@ check-mockery:
 
 gen-mocks: check-mockery
 	mockery -output pkg/core/mocks 			-outpkg mocks 			-dir pkg/core 											-name Client
-	mockery -output pkg/core/mocks 			-outpkg mocks 			-dir pkg/core 											-name ImageClient
 	mockery -output pkg/core/vendor_mocks 	-outpkg vendor_mocks 	-dir vendor/k8s.io/client-go/kubernetes 				-name Interface
 	mockery -output pkg/core/vendor_mocks 	-outpkg vendor_mocks 	-dir vendor/k8s.io/client-go/kubernetes/typed/core/v1 	-name CoreV1Interface
 	mockery -output pkg/core/vendor_mocks 	-outpkg vendor_mocks 	-dir vendor/k8s.io/client-go/kubernetes/typed/core/v1 	-name NamespaceInterface
 	mockery -output pkg/core/vendor_mocks 	-outpkg vendor_mocks 	-dir vendor/k8s.io/client-go/kubernetes/typed/core/v1 	-name ServiceAccountInterface
 	mockery -output pkg/core/vendor_mocks 	-outpkg vendor_mocks 	-dir vendor/k8s.io/client-go/kubernetes/typed/core/v1 	-name SecretInterface
-	mockery -output pkg/docker/mocks        -outpkg mocks           -dir pkg/docker                                         -name Docker
 	mockery -output pkg/fileutils/mocks     -outpkg mocks           -dir pkg/fileutils                                      -name Checker
 	mockery -output pkg/fileutils/mocks     -outpkg mocks           -dir pkg/fileutils                                      -name Copier
 

README.adoc

@@ -52,11 +52,6 @@ make build install
 ----
 NOTE: This installs the CLI in `$GOBIN`, or if that is not set, in the `bin` subdirectory of the directory specified in `$GOPATH`.
 
-
-== [[distro]] riff-distro
-
-A separate link:distro[riff-distro] CLI provides tooling to create distributions of images for on-premise riff installations.
-
 == Contributing to riff
 
 Please refer to the link:CONTRIBUTING.adoc[Contributors' Guide].