Add Msys2 package to installation page

[straight-shoota]

Note: shards is not yet available in the MSYS2 repository.

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[HertzDevil]

I'm not sure if listing only the MINGW64 package is a good idea, especially since UCRT64 is more common nowadays

[straight-shoota]

I'm happy to follow your lead 👍

[straight-shoota]

I'm wondering if we should wait with publishing this until shards is available as well?
@HertzDevil WDYT?

[HertzDevil]

The Shards PR for MSYS2 is msys2/MINGW-packages#23361, in case you are wondering. It is a separate package (same as Arch Linux).

[straight-shoota]

I have added shards to the instructions.
However with this I also felt it's a bit crowdy and hard to read. So I added labels in between the examples.

But this is still quite bulky.

So I've tried splitting into separate package entries:

I believe that makes more sense, even though they're all in MSYS2 and the first column should ideally be connected.
But that's not possible without changing the layout.

We could do is remove the labels in the other rows:

IMO that's not much improvement so I'm staying with number two.