Close #3380 (#4061)

* Delete index.ts

* Delete emoji.ts

* Update index.ts

src/server/api/index.ts

@@ -56,8 +56,6 @@ router.use(require('./service/discord').routes());
 router.use(require('./service/github').routes());
 router.use(require('./service/twitter').routes());
 
-router.use(require('./mastodon').routes());
-
 // Return 404 for unknown API
 router.all('*', async ctx => {
 	ctx.status = 404;