Update some links to resources for newbies:

1. Remove the "Download instructions"
2. The mentioned site is not updated any longer so it's just confusing for newbies.
3. Most newbies don't download via FTP.  Even if they do, they will normally download the ISO-images, not the different distributions.
4. www/en/where.sgml already describes how to get FreeBSD and is up-to-date.

2. "The Complete FreeBSD"
3. This book can be downloaded free of charge since 2006 from http://www.lemis.com/grog/Documentation/CFBSD/. So link to this site.

3. article "new-users".
4. It has been in the doc-tree for a long time now. So link to it.
5. The docs at the also mentioned FTP-site are outdated. Recent versions are available from the FreeBSD.org servers (just like the article itself).

Discussed with/approved by: remko@ (mentor)