Documentation: WakeOnLan depdendency is not clear to users

[zalphoid]

Problem

Its not clear to users that networking.interfaces.<name>.wakeOnLan requires systemd-networkd

Proposal

Relocate the current wakeOnLan configuration setting to a subset of systemd.network and provide an alternative that creates a oneshot per interface to enable the policy the user specifies leveraging ethtool.

OR

1. Update the documentation to state that it leverages systemd-networkd, for example, Whether to enable wol on this interface using systemd-networkd.
2. Add a dependency on systemd-networkd and warn users if they use wakeOnLan without it.

Checklist

• [x] checked latest Nixpkgs manual (source) and latest NixOS manual (source)
• [x] checked open documentation issues for possible duplicates
• [x] checked open documentation pull requests for possible solutions

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