ldb: remove obsolete copy of https://ldb.samba.org

ldb: remove obsolete copy of https://ldb.samba.org

lib/ldb/web/index.html used to be the source for
https://ldb.samba.org/, but the web page has continued to evolve in
minor ways without git keeping up.

The current difference is all http:// have been converted to https://
and a few URL domains and paths have changed.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Jennifer Sutton <jennifersutton@catalyst.net.nz>
Reviewed-by: Martin Schwenke <mschwenke@ddn.com>