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/dapr.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:        "dapr",
 		Description: "Distributed Application Runtime CLI",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "build-info", Description: "Print build info of Dapr CLI and runtime"},
 			{Name: "completion", Description: "Generates shell completion scripts"},
 			{Name: "bash", Description: "Generates bash completion scripts"},
@@ -32,7 +32,7 @@ func init() {
 			{Name: "version", Description: "Print the Dapr runtime and CLI version"},
 			{Name: "help", Description: "Help about any command"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--api-token-secret", Description: "The secret to use for the API token"},
 			{Name: "--app-id", Description: "The app id to annotate"},
 			{Name: "--app-max-concurrency", Description: "The maximum number of concurrent requests to allow"},