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/hardhat.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:        "hardhat",
 		Description: "Ethereum development environment",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "accounts", Description: "Prints the list of accounts"},
 			{Name: "check", Description: "Check whatever you need"},
 			{Name: "clean", Description: "Clears the cache and deletes all artifacts"},
@@ -20,7 +20,7 @@ func init() {
 			{Name: "run", Description: "Runs a user-defined script after compiling the project"},
 			{Name: "test", Description: "Runs mocha tests"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--emoji", Description: "Use emoji in messages"},
 			{Name: "--max-memory", Description: "The maximum amount of memory that Hardhat can use"},
 			{Name: "--help", Description: "Shows the help text or task's help if name is provided"},