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/cosign.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:        "cosign",
 		Description: "Provides utilities for attaching artifacts to other artifacts in a registry",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "attach", Description: "Provides utilities for attaching artifacts to other artifacts in a registry"},
 			{Name: "attestation", Description: "Attach attestation to the supplied container image"},
 			{Name: "sbom", Description: "Attach sbom to the supplied container image"},
@@ -38,7 +38,7 @@ func init() {
 			{Name: "version", Description: "Prints the version"},
 			{Name: "help", Description: "Help about any command"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--output-file", Description: "Log output to a file"},
 			{Name: "--timeout", Description: "Timeout for commands"},
 			{Name: "--verbose", Description: "Log debug output"},