Remote access your printer: best practices

[Frix-x]

Hello,

This PR is my attempt to draft a solution for the discussion we had recently in the contrib section of the Discord.

So I propose adding a new article titled "Securely Accessing Your Klipper 3D Printer Remotely: Best Practices and Risks" to the Documentation. This article addresses a growing concern within our community: the risks associated with unsecured remote access to Klipper 3D printers as it was seen (it's very easy to find publicly open machines). The goal is to educate users about these risks and guide them toward more secure practices.

Key Points Covered:

• Benefits of remote access and risks associated.
• Detailed security measures, including the use of VPNs (like Tailscale, Wireguard, ZeroTier) and alternative security methods for those who cannot use a VPN.
• Additional resources for users to refer to, including a dedicated guide for VPN setup and Mainsail documentation.

This can be considered as a draft and improved as you want it to be but I think it's already a good base to discuss on :)