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/aws.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:        "aws",
 		Description: "Use a specific profile from your credential file",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "account", Description: "Operations for Amazon Web Services Account Management"},
 			{Name: "amplifybackend", Description: "AWS Amplify Admin API"},
 			{Name: "apigatewayv2", Description: "Amazon API Gateway V2"},
@@ -60,7 +60,7 @@ func init() {
 			{Name: "trustedadvisor", Description: "TrustedAdvisor Public API"},
 			{Name: "runtime.sagemaker", Description: "The Amazon SageMaker runtime API"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--profile", Description: "Use a specific profile from your credential file"},
 		},
 	})