osx: option + arrow key cli shortcut in iterm2, zsh, and vscode

[nitrocode]

Much easier to set the natural text editing preset:

https://apple.stackexchange.com/a/293988/282367

Old:

• https://coderwall.com/p/a8uxma/zsh-iterm2-osx-shortcuts - .zshrc stuff
• https://stackoverflow.com/a/23963086/2965993 - iterm2 bindings
• https://stackoverflow.com/a/38494284/2965993 - change default vscode app