feat: refactor code structure

main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	_ "github.com/mattn/go-sqlite3"
+
+	"github.com/boojack/corgi/cmd"
+)
+
+func main() {
+	err := cmd.Execute()
+	if err != nil {
+		panic(err)
+	}
+}