Explain how to set up WelcomeBot to run indefinitely

[shaunagm]

To work on this task, go to the original issue.

I'd like to run WelcomeBot in a channel I moderate, but I haven't run an IRC bot before, and I'm not sure how to set up a bot to run indefinitely/permanently. I'd like to see a bit of explanation for recommended ways to do this.

For example, my friend suggested that I could run it inside a screen session on the tiny server that I use for running irssi inside screen; I haven't tried setting this up yet though.