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/astro.go

@@ -1,14 +1,14 @@
 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:        "astro",
 		Description: "Add an integration",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "add", Description: "Add an integration"},
 			{Name: "build", Description: "Build your project and write it to disk"},
 			{Name: "check", Description: "Check your project for errors"},
@@ -21,7 +21,7 @@ func init() {
 			{Name: "disable", Description: "Disable anonymous data collection"},
 			{Name: "reset", Description: "Reset anonymous data collection settings"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--yes", Description: "Accept all prompts"},
 			{Name: "--drafts", Description: "Include Markdown draft pages in the build"},
 			{Name: "--watch", Description: "Watch Astro files for changes and re-run checks"},