config: merge the irc config into Corto's config

Before this commit Corto's irc config was in a separate file, because the irc bot code expects a config file on disk. Work around this limitation by generating a config file. This also allows us to to type check the config file.

We switch go github.com/goccy/go-yaml to read the yaml config, since it supports reading json tags on go structs.

remove the duplicate phaburl var while we are there.