feat: add astal status bar

astal/app.ts

@@ -0,0 +1,10 @@
+import { App } from "astal/gtk3";
+import style from "./style.scss";
+import Bar from "./widget/Bar";
+
+App.start({
+  css: style,
+  main() {
+    App.get_monitors().map(Bar);
+  },
+});