doc: add release about for AmneziaWG support (#406378)

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- [AmneziaVPN](https://amnezia.org/en), an open-source VPN client, with a key feature that enables you to deploy your own VPN server on your server. Available as [programs.amnezia-vpn](#opt-programs.amnezia-vpn.enable).

- [AmneziaVPN](https://amnezia.org/en), a self-hostable open-source VPN client, is available in two variants:

  - [programs.amnezia-vpn](#opt-programs.amnezia-vpn.enable): a GUI client which can also deploy a VPN endpoint to a remote server

  - {option}`networking.wireguard` adds support for the [AmneziaWG](https://docs.amnezia.org/documentation/amnezia-wg/) variant of the protocol, featuring better masking against Deep Packet Inspection. The variant to be used is set per interface as `networking.wireguard.interfaces.<name>.type`, defaulting to wireguard.

- [Bazecor](https://github.com/Dygmalab/Bazecor), the graphical configurator for Dygma Products.

    After you run ALTER EXTENSION, you must run [this SQL script](https://github.com/timescale/timescaledb-extras/blob/master/utils/2.15.X-fix_hypertable_foreign_keys.sql). For more details, see the following pull requests [#6797](https://github.com/timescale/timescaledb/pull/6797).

    PostgreSQL 13 is no longer supported in TimescaleDB v2.16.

- `networking.wireguard.enable = true` does not always add `wireguard-tools` to system packages anymore. Only when wireguard interfaces are configured, the backing implementation packages are added to system PATH.

- `virtualisation/azure-common.nix`'s filesystem and grub configurations have been moved to `virtualisation/azure-image.nix`. This makes `azure-common.nix` more generic so it could be used for users who generate Azure image using other methods (e.g. nixos-generators and disko). For existing users depending on these configurations, please also import `azure-image.nix`.

- `zammad` has had its support for MySQL removed, since it was never working correctly and is now deprecated upstream. Check the [migration guide](https://docs.zammad.org/en/latest/appendix/migrate-to-postgresql.html) for how to convert your database to PostgreSQL.