Update zsh prompt

[adarsh]

Reason for Change

Changes

• Extract prompt stuff into a /zsh directory.
• Add a prompt.zsh file to encapsulate that work in one file.
• Move everything from zlogin into zshrc.
• Add some nice functions for colors, padding, etc to make the script code reusable.
• Add a git status symbol to the prompt to indicate staged/clean/dirty.
• Set the git branch status in /tmp in a fancy way to avoid rerunning repeatedly.

  Minor

• Remove auto-pairs plugin, it's super irritating, I've decided.

  Attribution

BIG thanks to @gabebw for this zsh prompt makeover.

This is all built on top of his dotfiles with no innovation.

Follow his dotfiles here: https://github.com/gabebw/dotfiles

[adarsh]

@gabebw I believe this is good, since we did it together, but a second glance would be appreciated.

[adarsh]

[gabebw]

:heart_eyes: :heart_eyes: :heart_eyes:

One comment, then looks good.