Simplify the installation process

[flavio]

Right now users can go to our GH release page and download the kwctl binary from it.

We can improve their installation story by integrating with some installers like:

• https://scoop.sh/
• https://brew.sh/ done via community contribution
• https://nixos.org/

and similar

[flavio]

@nunix Given you're a Windows expert, which distribution mechanism should we use for this OS? Is scoop the most popular one, are the other alternatives to take into account?