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/sfdx.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:        "sfdx",
 		Description: "Analyze (lint) Aura component code",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "force:lightning:lint", Description: "Analyze (lint) Aura component code"},
 			{Name: "fig-completion", Description: "Generate a Fig completion spec"},
 			{Name: "commands", Description: "List all the commands"},
@@ -60,7 +60,7 @@ func init() {
 			{Name: "force:limits:recordcounts:display", Description: "Display record counts for the specified standard and custom objects"},
 			{Name: "force:org:display", Description: "Get the description for the current or target org"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--json", Description: "Format output as json"},
 			{Name: "--loglevel", Description: "Logging level for this command invocation"},
 			{Name: "-i", Description: "Pattern used to ignore some folders"},