samples: Update sample configurations

samples: Update sample configurations

- Remove compression settings. Not recommended anymore.
- Remove old cipher setting. Replaced by data-ciphers negotiation.
- Add comment how to set data-ciphers for very old clients.
- Remove/reword some old comments. e.g. no need to reference
  OpenVPN 1.x anymore.
- Mention peer-fingerprint alternative.
- comment out "tls-auth" as that is not needed for a bare-bones VPN config
  and needs additional setup.

Github: #511
Change-Id: I1a36651c0dea52259533ffc00bccb9b03bf82e26
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Arne Schwabe <arne-openvpn@rfc2549.org>
Message-Id: <20240325071320.11348-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg28451.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit b0fc10abd06fa2307e95c8a60fa94f7ccc08d2ac)