Attribute Tuwunel's status as the conduwuit successor

The former conduwuit maintainer (@x86pup, formerly @girlbossceo)
clarified in the PR thread that they endorse Tuwunel as conduwuit's
successor, and the archived conduwuit repo's README points there too.
Update the migration section in the conduwuit doc and the Tuwunel
CHANGELOG entry to reflect this with attribution.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/5200.

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 Thanks to [Jason Volk](https://github.com/jevolk), the playbook now supports the [Tuwunel](./docs/configuring-playbook-tuwunel.md) homeserver as an optional alternative to Synapse.
 
-Tuwunel is a fork of [conduwuit](./docs/configuring-playbook-conduwuit.md) written in Rust. Like [Continuwuity](./docs/configuring-playbook-continuwuity.md), it continues development on top of conduwuit's database format.
+Tuwunel is a fork of [conduwuit](./docs/configuring-playbook-conduwuit.md) written in Rust. The former conduwuit maintainer [endorses Tuwunel as conduwuit's successor](https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/5200#issuecomment-4396211185). Like [Continuwuity](./docs/configuring-playbook-continuwuity.md), Tuwunel continues development on top of conduwuit's database format.
 
 Existing installations do **not** need to be updated. **Synapse is still the default homeserver implementation** installed by the playbook.
 

docs/configuring-playbook-conduwuit.md

@@ -31,7 +31,7 @@ systemctl disable --now matrix-conduwuit.service
 
 ## Migrating to Tuwunel
 
-[Tuwunel](configuring-playbook-tuwunel.md) is a fork of conduwuit which reads its database directly, so migration is possible. Please refer to [this section](./configuring-playbook-tuwunel.md#migrating-from-conduwuit) for details.
+[Tuwunel](configuring-playbook-tuwunel.md) is a fork of conduwuit, [endorsed as conduwuit's successor](https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/5200#issuecomment-4396211185) by the former conduwuit maintainer. It reads conduwuit's database directly, so migration is possible. Please refer to [this section](./configuring-playbook-tuwunel.md#migrating-from-conduwuit) for details.
 
 ## Migrating to Continuwuity