Install and Configure NixOS on a Linode Proposed Changes

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Link: https://www.linode.com/docs/guides/install-nixos-on-linode/
## Issue

When following these instructions, I ran into this error when running the NixOS installer `nixos-install`.

Error snippet:
The option fileSystems."/".device has conflicting definition values:
- configuration.nix: /dev/sda
- hardware-configuration.nix: /dev/disk/by-uuid/...

## Suggested Fix

Recommend removing the 'Rewrite Device Identifiers' section and its code. You're defining the same option twice:

1. hardware-configuration.nix (generated by nixos-generate-config) already sets `fileSystems."/".device` to a stable path like `/dev/disk/by-uuid/....`
2. The guide then has you set it again in configuration.nix to /dev/sda, which creates a conflict

The fix was to remove the `fileSystems."/"` block and `swapDevices` block that the guide tells you to add to /mnt/etc/nixos/configuration.nix. Leave the entries in /mnt/etc/nixos/hardware-configuration.nix as-is (UUID-based). Re-run `nixos-install`

There are potential overrides but it works fine without those configuration settings.

All other instructions worked fine, except the installer disk size which has already been reported in issues [7348](https://github.com/linode/docs/issues/7348) and [7361](https://github.com/linode/docs/issues/7361). Thanks! Great guide.

Open the linked Install NixOS on Linode guide and find the “Rewrite Device Identifiers” section. Review the fileSystems and swapDevices blocks it instructs users to add to /mnt/etc/nixos/configuration.nix, then verify the guide leaves the generated hardware-configuration.nix entries unchanged. Done means the instructions no longer create conflicting device definitions and the nixos-install flow is consistent.

Written by the indexing model from the issue text.