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/sys/deta.go

@@ -1,14 +1,14 @@
 package sys
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "deta",
 		Description: "Runtime",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "login", Description: "Trigger the login process for the Deta CLI"},
 			{Name: "version", Description: "Print the Deta version"},
 			{Name: "upgrade", Description: "Upgrade Deta CLI version"},
@@ -41,7 +41,7 @@ func init() {
 			{Name: "expression", Description: "The cron expression to be set"},
 			{Name: "remove", Description: "Remove a schedule from a Deta Micro"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-h", Description: "Show help for login"},
 			{Name: "-v", Description: "Upgrade CLI to specific version"},
 			{Name: "-n", Description: "Create a micro with Node (node14.x) runtime"},