howto-compile-linux: Revise for cgi-bin/latest

* Use cgi-bin/latest for downloading
* Update to use "cd ~/build/"

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
website: contrib: Post early: Add cclive-devel link

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
website: License: Add AGPLv3+

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
website: Use cgibin/latest for download

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>