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/limactl.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:        "limactl",
 		Description: "Lima: Linux virtual machines, with a focus on running containers",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "completion", Description: "Generate the autocompletion script for the specified shell"},
 			{Name: "copy", Description: "Copy files between host and guest"},
 			{Name: "delete", Description: "Delete an instance of Lima"},
@@ -22,7 +22,7 @@ func init() {
 			{Name: "stop", Description: "Stop an instance"},
 			{Name: "validate", Description: "Validate YAML files"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-h", Description: "Debug mode"},
 			{Name: "--no-descriptions", Description: "Disable completion descriptions"},
 			{Name: "-r", Description: "Copy directories recursively"},