Reuse DEADAGE rather than defining our own constant.
Re-enable buildfarm tests.
http -> https
Update Samba build farm to new web site layout.

Reviewed-By: Jelmer Vernooij <jelmer@samba.org>
Revert style changes on instructions page.
Merge https://github.com/jelmer/build-farm after resolving final conflicts

Signed-off-by: krishnatejaperannagari <krishnatejaperannagari@gmail.com>