Point to new wiki (#700)

* doc improvements

* remove typo

Author: dormieriancitizen

README.md

@@ -28,7 +28,7 @@ Any bugs, suggestions or issues can be raised by creating an issue on this repo.
 ## Documentation
 
 You can learn how to setup Ballsdex and use all of its tools on the
-[wiki](https://github.com/laggron42/BallsDex-Discordbot/wiki/)!
+[wiki](wiki.ballsdex.com)!
 More sections are added progressively.
 
 ## Supporting

docs/selfhosting/installation/installing-ballsdex.md

@@ -57,6 +57,9 @@ To run Ballsdex, we need Docker and git.
    Press `q` to exit this screen.
 
 3. Give your user the docker group. This will avoid having to use `sudo` every time you use Docker.
+!!! warning
+You do **not** need to replace \${USER} with your user! The shell will replace it for you.
+
    ```bash { .copy }
    sudo usermod -aG docker ${USER}
    su - ${USER}
@@ -168,4 +171,4 @@ To shut down the bot in this mode, run `docker compose down`.
 
 Even if your bot is online, there are no countryballs yet, they need to be added through the administration panel, your tool to control the bot's content.
 
-**The next step of this tutorial is [here](../admin-panel/getting-started.md)**
+**The next step of this tutorial is [here](../admin-panel/getting-started.md)**