chore: keep d.js client initialization up to date

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[jpbberry]

topgg-autoposter is purposefully library agnostic. I don't think this is a good idea as the client initialization is different across discord.js and eris for example.

const Eris = require("eris");

// Replace TOKEN with your bot account's token
const bot = new Eris("Bot TOKEN", {
    intents: [
        "guildMessages"
    ]
});

vs

const { Client, GatewayIntentBits } = require('discord.js');
const client = new Client({ intents: [GatewayIntentBits.Guilds] });

In a perfect world I'd not even include the initialization, I just want to make sure that the client variable is obvious.

[Idris1401]

then the client initialization should be fully removed imo (also the current example is for discord.js. so if you wanna keep it, it needs to be updated)

[jpbberry]

The point of it is to give an example of a client initialization, it isn't discord.js because it's not platform specific. It's an initialization of a Discord client, both eris, djs, and others have the concept of client initialization.