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/cloudflared.go

@@ -1,19 +1,19 @@
 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:        "cloudflared",
 		Description: "Specify the hostname of your application",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "install", Description: "Install cloudflared as an user launch agent"},
 			{Name: "uninstall", Description: "Uninstall the cloudflared launch agent"},
 			{Name: "help", Description: "Shows a list of commands or help for one command"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--hostname", Description: "Specify the hostname of your application"},
 			{Name: "--destination", Description: "Specify the destination address of your SSH server"},
 			{Name: "--url", Description: "Specify the host:port to forward data to Cloudflare edge"},