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/capacitor.go

@@ -1,20 +1,20 @@
 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:        "capacitor",
 		Description: "Add a native platform project to your app",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "add", Description: "Add a native platform project to your app"},
 			{Name: "ls", Description: "List all installed Cordova and Capacitor plugins"},
 			{Name: "sync", Description: "This command runs copy and then update"},
 			{Name: "update", Description: "Updates the native plugins and dependencies referenced in package.json"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--list", Description: "Print a list of target devices available to the given platform"},
 			{Name: "--target", Description: "Run on a specific target device"},
 			{Name: "--deployment", Description: "Podfile.lock won't be deleted and pod install will use --deployment option"},