refactor(helpers): separate functions into files (#667)

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/webhooks/delete_webhook.ts

@@ -0,0 +1,12 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import { endpoints } from "../../util/constants.ts";
+import { requireBotChannelPermissions } from "../../util/permissions.ts";
+
+/** Delete a webhook permanently. Requires the `MANAGE_WEBHOOKS` permission. Returns a undefined on success */
+export async function deleteWebhook(channelID: string, webhookID: string) {
+  await requireBotChannelPermissions(channelID, ["MANAGE_WEBHOOKS"]);
+
+  const result = await RequestManager.delete(endpoints.WEBHOOK_ID(webhookID));
+
+  return result;
+}