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/surreal.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:        "surreal",
 		Description: "Database authentication password to use when connecting [default: root]",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "help", Description: "Print this message or the help of the given subcommand(s)"},
 			{Name: "start", Description: "Start the database server"},
 			{Name: "path", Description: "Database path used for storing data [env: DB_PATH=] [default: memory]"},
@@ -27,7 +27,7 @@ func init() {
 			{Name: "version", Description: "Output the command-line tool version information"},
 			{Name: "sql", Description: "Start an SQL REPL in your terminal with pipe support"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--pass", Description: "Database authentication password to use when connecting [default: root]"},
 			{Name: "--user", Description: "Database authentication username to use when connecting [default: root]"},
 			{Name: "--conn", Description: "Remote database server url to connect to [default: https://cloud.surrealdb.com]"},