Faudra remplir ça les amis!

TODO: document the packages needed for Sflphone-gtk

Structure update (page_build, page_discuss, Build.txt).
Update Build.txt

Update to Build notes, update to Downloads.
Fix AsciiDoc macros.

Fixed the arrow in the content/images too.

Removed old screenshots.

We'll delete them right after, just to save them in the repos.

Moved images from doc/images to www/images since they are backend specific, and
need not be sitted beside the actual documentation (the 'NOTE' icon might
not be taken from the same place when rendered to a PDF later).

That way, we'll be able to use those icons elsewhere on the website, without
fetching them from the repository. They aren't going to be updated, also,
and thus don't need versioning very much.

Tiny fix for Build.txt

We can now retrieve files from the git repository without passing them
through `asciidoc`. This allows us to retrieve images, etc..

- Attempt to implement image rendering.

Removed also the now-unused libiax2.svn20060606.tar.gz that was included.

Remove also the libiax2.sh file. TODO: we need to automate the build of
libiax2 from that 'libs' directory.

Just moved docs that were outputted to doc/html to doc/doxygen/html-more-appropriate

We will need to automate the rewriting of URLS for IMAGEs in the program,
and cache everything, including images. Also, the update of asciidoc.conf
on the website, before compilation.

The contents of the website will be stored in doc/, because they are actually
documentation.