Improve bot prefix retrieval by using Deno.env and add error handling for missing prefix

src/messages.ts

@@ -2,10 +2,12 @@ import { Bot, Message } from "npm:discordeno@18.0.1";
 import { dropdeineMutti, r34test, refresh } from "./r34api.ts";
 import { logMessage } from "./logging.ts";
 import { dropYandere, dropYandere5, getPage, setPage } from "./yandereapi.ts";
-import * as dotenv from "jsr:@std/dotenv";
 
-const env = dotenv.loadSync();
-const prefix = env.BOT_PREFIX!;
+const prefix = Deno.env.get("BOT_PREFIX") ?? "";
+if (!prefix) {
+  throw new Error("BOT_PREFIX is missing!");
+}
+
 
 export async function messagehandler(bot: Bot, message: Message) {
     const command = message.content.split(" ")[0];