refactor!: organize directories and files (#268)

* refactor!: organize directory structure

* fix: avoid stack overflow err

* chore: swtch back to std/encoding for base64

* style: format source files

src/structures/role.ts

@@ -1,20 +0,0 @@
-import { RoleData, Unpromise } from "../types/types.ts";
-
-export async function createRole(data: RoleData) {
-  const { tags, ...rest } = data;
-
-  const roleTags = {
-    botID: tags?.bot_id,
-    premiumSubscriber: "premium_subscriber" in (tags ?? {}),
-    integrationID: tags?.integration_id,
-  };
-
-  return {
-    ...rest,
-    /** The @ mention of the role in a string. */
-    mention: `<@&${data.id}>`,
-    tags: roleTags,
-  };
-}
-
-export interface Role extends Unpromise<ReturnType<typeof createRole>> {}