Add landing page

src/app.ts

@@ -14,6 +14,7 @@ import instanceController from './controllers/api/instance.ts';
 import { createTokenController, oauthAuthorizeController, oauthController } from './controllers/api/oauth.ts';
 import { contextController, createStatusController, statusController } from './controllers/api/statuses.ts';
 import { requireAuth, setAuth } from './middleware/auth.ts';
+import { indexController } from './controllers/site.ts';
 
 interface AppEnv extends HonoEnv {
   Variables: {
@@ -65,6 +66,8 @@ app.get('/api/v1/mutes', emptyArrayController);
 app.get('/api/v1/domain_blocks', emptyArrayController);
 app.get('/api/v1/markers', emptyObjectController);
 
+app.get('/', indexController);
+
 export default app;
 
 export type { AppContext, AppController, AppMiddleware };

src/controllers/site.ts

@@ -0,0 +1,15 @@
+import { LOCAL_DOMAIN } from '@/config.ts';
+
+import type { AppController } from '@/app.ts';
+
+/** Landing page controller. */
+const indexController: AppController = (c) => {
+  return c.text(`Please connect with a Mastodon client:
+
+    ${LOCAL_DOMAIN}
+
+Ditto <https://gitlab.com/soapbox-pub/ditto>
+`);
+};
+
+export { indexController };