[R] Mirror of the R manuals with a new visual style

[Jon Clayden]

Dear all,

I've created a new mirror of the HTML versions of the main R manuals
at <http://r-manuals.flakery.org>. This mirror does not modify the
content of the manuals at all, but simply injects a new visual style
with the aim of making the text easier to read and navigate. It will
be updated after each release of R.

The code used to generate these versions is freely available at
<https://github.com/jonclayden/r-manuals>.

I hope some people find this useful. Comments are welcome.

All the best,
Jon