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/justfile.go

@@ -6,15 +6,15 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "just",
 		Description: "command runner",
 		MaxArgs:     1,
-		Generator: func(tokens []string, prefix string, partial string) []core.Suggestion {
+		Generator: func(tokens []string, prefix string, partial string) []spec.Suggestion {
 			file, err := os.Open("justfile")
 			if err != nil {
 				// try uppercase
@@ -25,7 +25,7 @@ func init() {
 			}
 			defer func() { _ = file.Close() }()
 
-			var suggestions []core.Suggestion
+			var suggestions []spec.Suggestion
 			seen := make(map[string]bool)
 			scanner := bufio.NewScanner(file)
 			// matching recipes like `build:`
@@ -61,7 +61,7 @@ func init() {
 						desc = lastComment
 					}
 
-					suggestions = append(suggestions, core.Suggestion{
+					suggestions = append(suggestions, spec.Suggestion{
 						Cmd:  cmd,
 						Desc: desc,
 					})