tRPC -> oRPC migration

### Describe the change

A detailed migration guide will help people migrate from tRPC to oRPC more easily

Related: https://github.com/unnoq/orpc/discussions/933, https://discord.com/channels/1308966753044398161/1408857518343458826

### URLs

_No response_

### Additional information

- [x] Would you be willing to help?