remove or document reload zshrc key binding

[russell-holgate]

Currently supercharge has a binding to reload .zshrc:
bindkey -s '^x' '^usource ${ZDOTDIR:-$HOME}/.zshrc\n'
I think this either needs to be documented in README.md and/or provide user feedback with an echo 'reloading zshrc...', or removed.

The reason I think it may be better to remove it is the potential for user errors:

• accidental ctrl-z or ctrl-c presses due to proximity
• expectation of a fresh shell (i.e. exec zsh)

[mamaraddio]

Personally I think this is a feature not something to be removed.

I'll add a few lines to document this on the README.md file because yeah it's always a good idea to document things.

In the meanwhile what do @ChristianChiarulli think about that?

Also community could express it's thought adding emojis to this comment.
👍 to keep the functionality
👎 to remove it