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/js/oxlint.go

@@ -1,14 +1,14 @@
 package js
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "oxlint",
 		Description: "All lints (except nursery)",
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-c", Description: "Path to Oxlint JSON configuration file"},
 			{Name: "--tsconfig", Description: "Specify the file to use as your .eslintignore"},
 			{Name: "--ignore-pattern", Description: "Specify file patterns to ignore (in addition to those in .eslintignore)"},