Drop the Deno target

The mod.ts entry points and import_map.in.json fed a deno.land/x
publication that never existed. pezkuwi-common dropped the same target.

packages/api-augment/src/mod.ts

@@ -1,4 +0,0 @@
-// Copyright 2017-2025 @pezkuwi/api-augment authors & contributors
-// SPDX-License-Identifier: Apache-2.0
-
-export * from './index.js';