Closes #18

Switches to the `zsh` builtin command `whence` to resolve the location
of the mise binary:

https://zsh.sourceforge.io/Doc/Release/Shell-Builtin-Commands.html

Adds warnings about Rosetta and running old versions of bash.

Covers direnv, and warnings in rtx.

Recommend that macOS users upgrade their bash.

This updates the developer documentation for initial setup to recommend
using rtx over asdf.

See https://gitlab.com/gitlab-com/runbooks/-/issues/134 for more details.

Stephen Dumesnil authored 2 years ago and Amy Phillips committed 2 years ago

Update: docs/developer-setup.md - Include instructions for verifying Apple Silicon or Intel-based Processor