✨(version) convey version information to the /config endpoint and footer

We add the machinery to get version information and display it discreetly.

src/frontend/apps/e2e/__tests__/app-desk/config.spec.ts

@@ -20,6 +20,7 @@ test.describe('Config', () => {
         ['en-us', 'English'],
         ['fr-fr', 'French'],
       ],
+      COMMIT: 'NA',
       FEATURES: {
         CONTACTS_CREATE: true,
         CONTACTS_DISPLAY: true,