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/fastly.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:        "fastly",
 		Description: "A CLI for interacting with the Fastly platform",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "acl", Description: "Manipulate Fastly ACLs (Access Control Lists)"},
 			{Name: "create", Description: "Create a new ACL attached to the specified service version"},
 			{Name: "delete", Description: "Delete an ACL from the specified service version"},
@@ -60,7 +60,7 @@ func init() {
 			{Name: "splunk", Description: "Manipulate Fastly service version Splunk logging endpoints"},
 			{Name: "sumologic", Description: "Manipulate Fastly service version Sumologic logging endpoints"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--name", Description: "'latest', 'active', or the number of a specific version"},
 			{Name: "--autoclone", Description: "If the selected service version is not editable, clone it and use the clone"},
 			{Name: "--service-id", Description: "Service ID (falls back to FASTLY_SERVICE_ID, then fastly.toml)"},