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/doppler.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:        "doppler",
 		Description: "The official CLI for Doppler Secret Operations Platform",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "activity", Description: "Get workplace activity logs"},
 			{Name: "get", Description: "Get workplace activity log"},
 			{Name: "changelog", Description: "View the CLI's changelog"},
@@ -53,7 +53,7 @@ func init() {
 			{Name: "settings", Description: "Get workplace settings"},
 			{Name: "setup", Description: "Setup the Doppler CLI for managing secrets"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-h", Description: "Config (e.g. dev)"},
 			{Name: "--fallback-only", Description: "Disable modifying the fallback file. secrets can still be read from the file"},
 			{Name: "--format", Description: "Do not exit if unable to write the fallback file"},