SILE on openSUSE!🎉

[Pi-Cla]

@alerque It is finally here! 🎊
https://build.opensuse.org/package/show/openSUSE:Factory/sile

All it took was a lot of lua packaging, and prompting someone to develop Luarocks macros for openSUSE to make packaging the Lua dependencies with Luarocks easier.

Now the package can be installed from the official repo, so I have already deleted it from my home project repo to avoid duplication.

[ctrlcctrlv]

hooray :D i don't use that distro but more packaging is always good, will hopefully make SILE a more popular typesetter!

[alerque]

We should add a note about this in both the README and our manual (Chapter 2, c02-gettingstarted.sil) with the distro specific minimal install command (assuming an otherwise default up to date system). @Pi-Cla core to send a PR to that effect? Or at least let me know what the package manager command is and I'll get it in. And thanks again for packaging!

[Pi-Cla]

@alerque the command would be just: sudo zypper in sile now

[alerque]

Docs added in c9171e4.