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/ops/argo.go

@@ -1,14 +1,14 @@
 package ops
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "argo",
 		Description: "If True, Use the HTTP client. Defaults to the ARGO_HTTP1 environment variable",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "archive", Description: "Manage the workflow archive"},
 			{Name: "delete", Description: "Delete a workflow in the archive"},
 			{Name: "get", Description: "Get a workflow in the archive"},
@@ -41,7 +41,7 @@ func init() {
 			{Name: "wait", Description: "Waits for workflows to complete"},
 			{Name: "watch", Description: "Watch a workflow until it completes"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--argo-base-href", Description: "If True, Use the HTTP client. Defaults to the ARGO_HTTP1 environment variable"},
 			{Name: "--argo-server", Description: "Username to impersonate for the operation"},
 			{Name: "--as-group", Description: "UID to impersonate for the operation"},