chore(commands): more commands for suggestions (#10)

## What's new
- color completion message command green
https://github.com/versenilvis/IRIS/pull/10/commits/6e141f5e6909fad1ec42725cce38d51729acf399
- new flat command folder structure
https://github.com/versenilvis/IRIS/pull/10/commits/87026a854a529ec5d5baed967d5f7a7f0085a24b
- fix some linter problems
https://github.com/versenilvis/IRIS/pull/10/commits/536de790cefda912f50bf4022e40ce2b965db2e2
- fix some gemini fix suggestions

commands/view/du.go

@@ -0,0 +1,18 @@
+package view
+
+import (
+	"github.com/versenilvis/iris/commands/core"
+)
+
+func init() {
+	core.Register(&core.Spec{
+		Name:        "du",
+		Description: "estimate file space usage",
+		Generator:   core.FileGenerator(),
+		Options: []core.Option{
+			{Name: "-h", Description: "human readable"},
+			{Name: "-s", Description: "summarize"},
+			{Name: "-a", Description: "all files"},
+		},
+	})
+}