[meta] about the relayer source code

according to the readme of this repo
```
This relay implementation was deprecated in the v2 relay upgrade in favor of a scalable alternative.
```

where can community developers and lovers find the v2 version of the relayer

Start with the repository README and inspect the deprecation note for the v2 relay upgrade. Confirm where community developers can find the v2 relayer source, then make that location explicit in the repository guidance; done means the v2 implementation has a clear, discoverable reference.

Written by the indexing model from the issue text.