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/rome.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:        "rome",
 		Description: "Rome CLI",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "check", Description: "Run the linter on a set of files"},
 			{Name: "ci", Description: "Run the linter and formatter check on a set of files"},
 			{Name: "format", Description: "Run the formatter on a set of files"},
@@ -20,7 +20,7 @@ func init() {
 			{Name: "version", Description: "Shows the Rome version information and quit"},
 			{Name: "help", Description: "Prints help message"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--colors", Description: "Set the formatting mode for markup"},
 			{Name: "--use-server", Description: "Connect to a running instance of the Rome daemon server"},
 			{Name: "--version", Description: "Show the Rome version information and quit"},