[arch-general] [RFC] Make Archlinux websites mobile friendly

[Alif M. A.]

I think it would be nice to have Arch websites mobile friendly, so that
it can be viewed comfortably on any devices with different screen size.

For starting point, let's make the wiki, which is the main source of
information, mobile friendly.

It's just a matter of adding meta viewport tag and another CSS file(s)
for smaller screen sizes.