Remove unused handler.ts file

src/handler.ts

@@ -1,18 +0,0 @@
-import { gossipDB } from '@/db.ts';
-import { type Event } from '@/event.ts';
-
-import { getAuthorRelays } from './gossip.ts';
-
-function handleEvent(event: Event): void {
-  handleRelays(event);
-}
-
-/** Add author relays into the database. */
-function handleRelays(event: Event): Promise<boolean[]> {
-  const relays = getAuthorRelays(event);
-  return Promise.all(
-    relays.map((relay) => gossipDB.put(event.pubkey, relay.toString())),
-  );
-}
-
-export { handleEvent };