Remove orphaned command_prompt page
Update deckrb and dependencies (required for .notes)
Add CLI presentation slides (a bit long, but it's a starting point)
Link to CLI presentation, move old page to extra credit
Fix several occurences of RailsBridge where the B was not capitalized
Add a line for finding the terminal equivalent for Chromebook (nitrous.io)

Suggested by Melissa. Can this terminal actually do all the things that
we do in the presentation? I'm not sure.
Merge pull request #161 from railsbridge-boston/cli-slides

CLI slides