Update Installation Instructions

[lachlan-smith]

Add git and rustup to installation instructions, as current installation steps do not result in a successful installation on a fresh install using archlinx-2020.12.01-x86_64.iso

[Morganamilo]

Can you show this not working on a default install? Also I do not recommend people use rustup.

[lachlan-smith]

See below output. I used rustup over rust as it is the Rust teams prefered way - but of course if you would prefer to instruct otherwise feel free. I just was trying to make the installation instructions work from start to finish on a fresh install (when I imagine a number of people will want to install this utility when setting up a new install and neededing AUR packages).

Alternatively, maybe adding some sort of "prerequests" section and simply advising the user to install git and the Rust toolchain in their own prefered way (linking back to the wiki) might be a more neutral way of addressing this?

https://gist.github.com/lachlan-smith/ebc22a5256bba2b5bf104d20672f4f95

[Morganamilo]

To me rustup is an advanced tool for managing multiple rust installs. It's only really useful for rust developers and if you are one of those I'd expect you to know how to configure it.

I did forget that pacman will forget the provider menu. But you still did deviate from the defaults by choosing 2. If you just still to the default and install rust then everything works.