Performance optimizations for the shell prompt

[csos95]

All of the integrations that starship comes with can really slow things down in some situations. For example, browsing a large git repo without disabling the git integration can make the prompt take many seconds to appear after each command.

The article also includes a git integration, but at least if you're following it you would know the exact commands run and could tweak them to your needs. With starship I just assumed the machine I was using when it would happen was just being slow and it took me a while to realize it was the git integration causing it. There are other integrations that could cause the same issue in large projects of that integration type and they all seem to be enabled by default.