Errors don't match the RealWorld spec

[yamcodes]

Describe the bug

Our errors match the structure of Elysia but not the RealWorld spec

https://realworld-docs.netlify.app/specifications/backend/error-handling/

Reproduction

Cause an error, like trying to add an article with an empty body

System Info

No response

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue that reports the same bug.
• Check that this is a concrete bug. For Q&A, open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[yamcodes]

This is solved in #174