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/pscale.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:        "pscale",
 		Description: "The client ID for the PlanetScale CLI application",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "audit-log", Description: "List audit logs"},
 			{Name: "list", Description: "List all audit logs of an organization"},
 			{Name: "auth", Description: "Login and logout via the PlanetScale API"},
@@ -45,7 +45,7 @@ func init() {
 			{Name: "shell", Description: "Open a MySQL shell instance to a database and branch"},
 			{Name: "signup", Description: "Signup for a new PlanetScale account"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--client-id", Description: "The client ID for the PlanetScale CLI application"},
 			{Name: "--client-secret", Description: "The client ID for the PlanetScale CLI application"},
 			{Name: "--database", Description: "The database this project is using"},