Copy pdf docs to new website folder

Patch related to http://codereview.appspot.com/5500069/.

There is a git pull request on github to put pdf files in lilypond-extra.

These patches copy the files to the correct place, and rewrite links.

I did some changes on the contribution documentation page as well, given that is misses some details. Also not that the wbesite page is not up-to-date to the latest git repository version.

[Graham Percival, 2012-01-01 23:14:05]

LGTM, but I had to add issue 2166 to track this.

[ambs, 2012-01-03 18:31:54]

On 2012/01/01 23:14:05, Graham Percival wrote:
> LGTM, but I had to add issue 2166 to track this.

Sorry, didn't understand what you mean by "add issue 2166 to track this"

Anything I can do to help this to get live?

[Graham Percival, 2012-01-03 20:36:48]

On Tue, Jan 03, 2012 at 06:31:54PM +0000, hashashin@gmail.com wrote:
> Sorry, didn't understand what you mean by "add issue 2166 to track this"

It's not relevant unless you're going to be making other patches.
If you are, read the "summary for experienced developers" again in
more detail.  The git-cl step wasn't done properly.

> Anything I can do to help this to get live?

Wait a day or two.  It's on the countdown right now.  See the
summary for experienced developers if you don't know what that
means.

Cheers,
- Graham

[Julien Rioux, 2012-03-17 13:18:23]

On 2012/01/03 20:36:48, Graham Percival wrote:
> On Tue, Jan 03, 2012 at 06:31:54PM +0000, mailto:hashashin@gmail.com wrote:
> > Sorry, didn't understand what you mean by "add issue 2166 to track this"
> 
> It's not relevant unless you're going to be making other patches.
> If you are, read the "summary for experienced developers" again in
> more detail.  The git-cl step wasn't done properly.
> 
> > Anything I can do to help this to get live?
> 
> Wait a day or two.  It's on the countdown right now.  See the
> summary for experienced developers if you don't know what that
> means.
> 
> Cheers,
> - Graham

This rietveld issue can be closed.