[FR] Get rid of conf as shared global state

[mtlynch]

What

I'd like to continue #46 by removing the accessors from conf and read the configuration from a single place in the main package, like this:

config, err := conf.Load()
if err != nil {
  log.Fatalf("invalid config: %v", err)
}
repo.Init(config.DB)

go pull.NewPuller(repo.NewFeed(repo.DB), repo.NewItem(repo.DB)).Run()

api.Run(api.apiParams{
  Password: config.Password,
  Host: config.Host,
  Port: config.Port,
  TLSCert: config.TLSCert,
  TLSKey: config.TLSKey,
})

I'm happy to implement this if it sounds good to you.

Why

Shared global state makes it hard to understand how different components fit together. Eliminating the global Conf struct makes it easier to unit test code because tests can pass values directly to the functions they exercise rather than setting the Conf global in advance to influence behavior.

(Optional) How

See code example above.

[0x2E]

Make sense. Would love to merge if you implement it :D