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/js/shadcn_ui.go

@@ -1,21 +1,21 @@
 package js
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "shadcn-ui",
 		Description: "Shadcn UI CLI",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "add", Description: "Add a component to your project"},
 			{Name: "components", Description: "The components to add"},
 			{Name: "diff", Description: "Check for updates against the registry"},
 			{Name: "component", Description: "The component name"},
 			{Name: "init", Description: "Initialize your project and install dependencies"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-y", Description: "Skip confirmation prompt"},
 			{Name: "-o", Description: "Overwrite existing files"},
 			{Name: "-c", Description: "The working directory. defaults to the current directory"},