feat(refacto): move everything in internal package

This allows to install katenary with `go install` and to clean up the
project folder.

internal/utils/icons.go

@@ -0,0 +1,31 @@
+package utils
+
+import "fmt"
+
+// Icon is a unicode icon
+type Icon string
+
+// Icons used in katenary.
+const (
+	IconSuccess    Icon = "✅"
+	IconFailure    Icon = "❌"
+	IconWarning    Icon = "❕"
+	IconNote       Icon = "📝"
+	IconWorld      Icon = "🌐"
+	IconPlug       Icon = "🔌"
+	IconPackage    Icon = "📦"
+	IconCabinet    Icon = "🗄️"
+	IconInfo       Icon = "🔵"
+	IconSecret     Icon = "🔒"
+	IconConfig     Icon = "🔧"
+	IconDependency Icon = "🔗"
+)
+
+// Warn prints a warning message
+func Warn(msg ...any) {
+	orange := "\033[38;5;214m"
+	reset := "\033[0m"
+	fmt.Print(IconWarning, orange, " ")
+	fmt.Print(msg...)
+	fmt.Println(reset)
+}