Update relayer docs with infos regarding the IC component of the architecture

[guidocazzaniga]

I'm currently able to run the relayer, but it logs the following error every time it receives a new email:

2024-05-23 16:48:25 May 23 14:48:25.642 INFO selector 20230601, func: check_and_update_dkim, version: 1.1.0
2024-05-23 16:48:25 May 23 14:48:25.642 ERRO Error handling email: No such file or directory (os error 2), func: email_handler_fn, version: 1.1.0
2024-05-23 16:48:25 May 23 14:48:25.643 INFO Event: Error { email_addr: "[email protected]", error: "No such file or directory (os error 2)" }, func: event_consumer_fn, version: 1.1.0

My guess is that it can't find the IC .pem identity file, however I could not find instructions on how to setup this part of the architecture and what its function is

[Divide-By-0]

Hey, you should be able to just ssh key gen any pem file.