docs: add some notes on overrides; fix defaults

README.md

@@ -61,7 +61,7 @@ As a heads-up, the development environment uses the following ports:
 | MinIO                     |     14009      |
 | Maildev                   | 14025<br>14080 |
 | Revolt Web App            |     14701      |
-| RabbitMQ                  |  5672<br>15672 |
+| RabbitMQ                  | 5672<br>15672  |
 | `crates/delta`            |     14702      |
 | `crates/bonfire`          |     14703      |
 | `crates/services/autumn`  |     14704      |
@@ -91,6 +91,38 @@ If you'd like to change anything, create a `Revolt.overrides.toml` file and spec
 > proxy = "https://abc@your.sentry/1"
 > ```
 
+> [!TIP]
+> If you have port conflicts on common services, you can try the following:
+>
+> ```yaml
+> # compose.override.yml
+> services:
+>   redis:
+>     ports: !override
+>       - "14079:6379"
+>
+>   database:
+>     ports: !override
+>       - "14017:27017"
+>
+>   rabbit:
+>     ports: !override
+>       - "14072:5672"
+>       - "14672:15672"
+> ```
+>
+> And corresponding Revolt configuration:
+>
+> ```toml
+> # Revolt.overrides.toml
+> [database]
+> mongodb = "mongodb://127.0.0.1:14017"
+> redis = "redis://127.0.0.1:14079/"
+>
+> [rabbit]
+> port = 14072
+> ```
+
 Then continue:
 
 ```bash