chore: use warning labels (#47)

README.md

@@ -16,7 +16,8 @@ Related issue: https://github.com/revoltchat/delta/issues/116
 
 This repository provides reasonable defaults, so you can immediately get started with it on your local machine.
 
-> ⚠️ Not recommended for production, see below for full guide.
+> **Warning**
+> This is not recommended for production usage - see below for the full guide.
 
 ```bash
 git clone https://github.com/revoltchat/self-hosted revolt
@@ -38,7 +39,7 @@ cd revolt
 
 Copy the `.env` file and edit according to your needs.
 
-> ⚠️ The default configuration is intended for testing and only works on your local machine. If you want to deploy to a remote server, you need to edit the URLs in the `.env` file. \
+> **Warning**: The default configuration is intended for testing and only works on your local machine. If you want to deploy to a remote server, you need to edit the URLs in the `.env` file. \
 > If you get a network error when trying to log in, **double check your configuration before opening an issue.**
 
 ```bash