refactor: construct application layers from supplied sources

src/app/layers/rocketLaunches.js

@@ -0,0 +1,12 @@
+import { createRocketLaunchesLayer } from '../../layers/launches/index.js';
+import * as geometry from '../../celestialRing.js';
+import * as overlays from '../../overlays/worldOverlay.js';
+import * as render from '../../renderGovernor.js';
+
+/** Construct one layer using the application scene owners and a supplied source. */
+export function createApplicationLaunches({ source, satellites }) {
+  return createRocketLaunchesLayer({
+    source,
+    services: { satellites, geometry, overlays, render },
+  });
+}