connect: personalise channels and servers

This reverts commit 7f7c5e064eb2324663b8a100f1aef03c145e2738.
iii: default network is (local) freenode
spawnchannels: autospawn channels of interest
iii: no completion until I fix the broken ^[ suffixes from words
iii: do not notify of frigg pancakes and GitHub bots messages
iii: use tailf instead of tail -f