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/runner/makefile.go

@@ -5,14 +5,14 @@ import (
 	"os"
 	"regexp"
 
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "make",
 		Description: "build automation",
-		Generator: func(tokens []string, prefix string, partial string) []core.Suggestion {
+		Generator: func(tokens []string, prefix string, partial string) []spec.Suggestion {
 			// Read the Makefile
 			file, err := os.Open("Makefile")
 			if err != nil {
@@ -21,7 +21,7 @@ func init() {
 			}
 			defer func() { _ = file.Close() }()
 
-			var suggestions []core.Suggestion
+			var suggestions []spec.Suggestion
 			seen := make(map[string]bool)
 			scanner := bufio.NewScanner(file)
 			// Matches targets like `build:`, `  run :`, etc.
@@ -42,7 +42,7 @@ func init() {
 					if prefix != "" {
 						cmd = prefix + " " + target
 					}
-					suggestions = append(suggestions, core.Suggestion{
+					suggestions = append(suggestions, spec.Suggestion{
 						Cmd:  cmd,
 						Desc: "make target",
 					})