Implement guilds/#guild_id/regions route

src/routes/guilds/#guild_id/regions.ts

@@ -0,0 +1,10 @@
+import { Config } from "@fosscord/server-util";
+import { Request, Response, Router } from "express";
+
+const router = Router();
+
+router.get("/", async (req: Request, res: Response) => {
+	return res.json(Config.get().regions.available);
+});
+
+export default router;