Command examples in INSTALL.md contain annoying $ command prompt

[chen-ni]

When you click the copy button for the code snippets in the installation guide, you end up copying the command prompts ($) as well. Pasting it directly in the terminal will cause an error:

(base) Chen-deMacBook-Pro:~ chenni$ $ brew update
-bash: $: command not found
(base) Chen-deMacBook-Pro:~ chenni$ $ brew install goenv

It's very annoying for the user. I think we should remove the unnecessary command prompts so that the user can easily copy and execute the commands.

I'd be glad to create a PR for this. What do you think?

[syndbg]

Fair. It's more of a style to add them but I don't mind them removed.

Merged 👍