Add dev blog post for signer dpeloyment models

Author: jpraynaud

docs/blog/2023-06-28-signer-deployment-models/img/signer-deployment-naive.jpg

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+---
+title: Mithril Signer Deployment Models
+authors:
+- name: Mithril Team
+tags: [spo, mithril signer, deployment model, production]
+---
+
+### The new Mithril Signer Deployment Models for SPOs will be introduced soon
+
+**Epic**: `Prepare Mithril Signer deployment model for SPO` [#862](https://github.com/input-output-hk/mithril/issues/862)
+
+:warning: The Mithril Signer Deployment Models is not deployed yet to the `pre-release-preview` and `release-preprod` network. A special announcement will be made on the **moria** Discord channel when a new release candidate distribution is ready.
+
+All these information will be available at the updated [`Run a Mithril Signer node (SPO)`](https://mithril.network/doc/manual/getting-started/run-signer-node) guide. In the mean time, a preview of the Mithril signer setup with the **production** deployment model is available [here](https://mithril.network/doc/next/manual/getting-started/run-signer-node). In the new **production** deployment model, a new **Mithril Relay** has been introduced and requires an extra setup effort versus the **naive** deployment model that is currently ran by the pioneer SPOs on the Mithril test networks.
+
+:::info
+
+We strongly encourage the volunteer SPOs to test the **production** deployment (once it is available of the `pre-release-preview` network) and to give us their feedback on the setup (clarity of the documentation, if you needed some fixes to make it work, ...).
+
+:::
+
+Here is the schema of the **production** deployment for the `mainnet`:
+[![Production Mithril Signer Deployment Model](img/signer-deployment-production.jpg)](img/signer-deployment-production.jpg)
+
+and the schema of the **naive** deployment only for the `testnet`:
+[![Naive Mithril Signer Deployment Model](img/signer-deployment-naive.jpg)](img/signer-deployment-naive.jpg)
+
+Feel free to reach out to us on the [Discord channel](https://discord.gg/5kaErDKDRq) for questions and/or help.