Remove dependencies to make a lighter weight "verse".

[barryrowlingson]

The imports: and the scaffolding code stuck in every 'verse seems to be giving them dependencies on cli, crayon, dplyr, purrrr, rstudioapi and tibble - in many cases this would make for heavier dependencies than the things being included.

It would seem to be a bad idea to have infrastructure-building code depend on non-base functionality.