[tmuxinator] Add empty `tmuxinator` script

This fixes the `source` call in `zsh/config`
[README] Remove unneeded `bashrc`

Has been droped for good
[vim] Remove F2 as `paste` control

Already defined on F4 by janus base customizations :)

See https://github.com/carlhuda/janus#base-customizations
[vim] Remove unneeded color scheme settings
[Gemfile] Use HTTPS & add `Gemfile.lock`
[tmuxinator] Use new naming convention

Supresses deprecation warnings and guarantees a happy life.
[.gitignore] Ignore all files with `secret` prefix

Allows us to use `secret` files across the repo.
Just add `secret_` at the beginning of the file to 'mark' it secret.
[README] Update documentation