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/python/pre_commit.go

@@ -1,14 +1,14 @@
 package python
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "pre-commit",
 		Description: "Show help message and exit",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "autoupdate", Description: "Auto-update pre-commit config to the latest repos' versions"},
 			{Name: "clean", Description: "Clean out pre-commit files"},
 			{Name: "gc", Description: "Clean unused cached repos"},
@@ -23,7 +23,7 @@ func init() {
 			{Name: "uninstall", Description: "Uninstall the pre-commit script"},
 			{Name: "help", Description: "Show help for a specific command"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-h", Description: "Show help message and exit"},
 			{Name: "--color", Description: "Whether to use color in output. Defaults to `auto`"},
 			{Name: "--config", Description: "Path to alternate config file"},