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/deployctl.go

@@ -1,18 +1,18 @@
 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:        "deployctl",
 		Description: "Command line tool for Deno Deploy",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "deploy", Description: "Deploy a script with static files to Deno Deploy"},
 			{Name: "upgrade", Description: "Upgrade deployctl"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--exclude", Description: "Exclude files that match this pattern"},
 			{Name: "--include", Description: "Only upload files that match this pattern"},
 			{Name: "--no-static", Description: "Don't include the files in the CWD as static files"},