Fix docs to remove admin user recommendation

[archonsd]

I wish the documentation at https://github.com/dominik-korsa/discord-integration/wiki/Configuring-a-Discord-bot#configuring-webhooks was updated to remove the recommendation to give the bot administrator privs on the discord server.. it's sloppy, lazy, and dangerous to do that. I am trying to figure out the granular perms to make it work and I've got working messaging from minecraft to a discord channel, but no messaging back from the discord channel to Minecraft.

So far I'm giving it:

1. Create Expressions
2. Create Events
3. Send Messages
4. Create Public Threads
5. Send Messages in Threads
6. Embed Links
7. Mention Everyone
8. Use External Emojis
9. Use External Stickers
10. Add Reactions

Is there an additional permission that would let Discord talk to Minecraft, or is that not a feature of the plugin?