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/appwrite.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:        "appwrite",
 		Description: "Appwrite - Open-Source End-to-End Backend Server",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "login", Description: "The login command allows you to authenticate and manage a user account"},
 			{Name: "project", Description: "Initialise your Appwrite project"},
 			{Name: "function", Description: "Initialise your Appwrite cloud function"},
@@ -48,7 +48,7 @@ func init() {
 			{Name: "updatePhoneVerification", Description: "Update the user phone verification status by its unique ID"},
 			{Name: "client", Description: "The client command allows you to configure your CLI"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--databaseId", Description: "Database ID"},
 			{Name: "--all", Description: "Flag to initialize all databases"},
 			{Name: "--functionId", Description: "Function ID"},