Update dotfiles from installation verification

- Change npm package from karma to karma-cli in opt/homebrew and README
  as that is the CLI and the other version was better served per
  repository
- Add space on bash prompt to separate current working directory from
  'on' keyword
- Remove vim installation from brew installation as its being handled on
  the installation side now
- Fix the way `dotfiles -v` works so that it actually changes to the
  directory to verify the version, otherwise it would error because it
  checking against the current directory

Issue: #1