Move the errors page into the general section (#3929)

Author: DoctorJohn

docs/README.md

@@ -13,6 +13,7 @@ title: Strawberry docs
 - [Mutations](./general/mutations.md)
 - [Subscriptions](./general/subscriptions.md)
 - [Multipart Subscriptions](./general/multipart-subscriptions.md)
+- [Errors](./errors)
 - [Breaking changes](./breaking-changes.md)
 - [Upgrading Strawberry](./general/upgrades.md)
 - [FAQ](./faq.md)
@@ -42,8 +43,6 @@ title: Strawberry docs
 
 ## [Extensions](./extensions)
 
-## [Errors](./errors)
-
 ## Guides
 
 - [Accessing parent data](./guides/accessing-parent-data.md)