Add README with pages URL

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

README.md

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+# Configuration as Code — Puppet vs Ansible vs Terraform
+
+Presentation for the **Finistère Dev Meetup**.
+
+## 🌐 View the slides
+
+👉 **https://ministicraft.pages.git.cloud.arnaud-pc.fr/finistdev-configuration-as-code/**
+
+## 🛠️ Built with
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+- [Reveal.js](https://revealjs.com/) — HTML presentation framework
+
+## 📦 Deployment
+
+Slides are automatically published via [git-pages](https://codeberg.org/git-pages/git-pages) on every push to the `pages` branch.