refactor(commands): separate commands and its core into two folders (#32)

- I think it would be better if one for commands only, one for the spec
handling core logic so people won't be confused by the core logic inside
the commands folder (cleaner I guess)
- Regen docs

commands/sys/cdk8s.go

@@ -1,21 +1,21 @@
 package sys
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "cdk8s",
 		Description: "CDK for K8s",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "init", Description: "Create a new, empty CDK8S project"},
 			{Name: "type", Description: "Select language you are using"},
 			{Name: "import", Description: "Import a CRD schema to generate generate resources"},
 			{Name: "spec", Description: "Path to the CRD schema"},
 			{Name: "synth", Description: "Synthesizes Kubernetes manifests for all charts in your app"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--language", Description: "Output programming language"},
 			{Name: "--class-prefix", Description: "A prefix to add to all generated class names"},
 			{Name: "--no-class-prefix", Description: "Does not add a prefix to generated class names"},