Update Relayer configration docs and Examples

[shekohex]

Summary of changes

• Adds a example/config.toml file for quick start

Reference issue to close (if applicable)

• Closes #368
• Related to #366

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Code Checklist

• [ ] Tested
• [x] Documented

[Nutomic]

For the config files I would also write a test case which goes through all of them and attempts to parse them. If a config file fails to parse, the test fails and we notice that there is something wrong with the given config file. That way we can easily avoid broken config files. I can implement that if it sounds good.

[shekohex]

For the config files I would also write a test case which goes through all of them and attempts to parse them. If a config file fails to parse, the test fails and we notice that there is something wrong with the given config file. That way we can easily avoid broken config files. I can implement that if it sounds good.

I like the Idea, I will add a small sub-command to the relayer CLI to does this for us.

[Nutomic]

I dont think that requires a cli command, a simple #[test] function which walks through files in the config folder should be enough.

[shekohex]

CI is falling, needs #371 to be merged first and then will update my PR here.