Link installation scripts

[ann0see]

Related to https://github.com/jamulussoftware/installscripts/issues/1

The website should link a quick download to the installation scripts which are being removed from the main repo.

[gilgongo]

This should be part of (yet another) re-write of the install docs for Linux I think. Now that we have our .deb, everything to do with compilation (including here) should I think be moved off the site and into the compiling.md in the repo where such things usually live by convention.

Normal people don't compile (I'm joking, but you know what I mean) :-)

BTW stuff like Flatpak or non-deb methods can be mentioned on the website as links to compiling.md I think. The UX of Linux should ideally be the same as that of other platforms: download installer, read docs on how to set up.

I'll see if I can add this to my list of doc re-jigs and we can discuss on a PR?

See also #382

[ann0see]

Yes. That sounds good.