docs: update references to renamed commons repository (#11)

services/docs/content/en/root/concepts/principles.md

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+---
+title: Infrastructure principles
+description: Core principles providing a secure, predictable, and minimal-dependency environment.
+weight: 5
+---
+
+The Root framework is built on core principles designed to provide a secure, predictable, and minimal-dependency environment for independent self-hosted projects.
+
+## Predictability through structure {#predictability}
+
+Manual server configuration is prone to "configuration drift," where hosts intended to be identical slowly diverge. Root solves this by:
+
+- **Git-centric truth**: Every configuration, from UFW rules to crontabs, is stored in the repository.
+- **Idempotent automation**: [Actions](/root/glossary#action) are designed to be run multiple times without causing side effects, ensuring the host always matches the intended state.
+
+## Minimal dependency footprint {#minimalism}
+
+To ensure long-term maintainability, the framework avoids complex configuration management tools (like Ansible or Salt). Instead, it relies on:
+
+- **Bash**: The universal language of Unix systems.
+- **Docker**: For application isolation and environment consistency.
+- **Standard Linux tools**: Leveraging `systemd`, `ufw`, and `cron` directly.
+
+## Decentralization {#decentralization}
+
+Each [Node](/root/glossary#node) is an island. While they share the [Commons](/root/glossary#commons) library, they do not depend on a central "master" server. This architecture ensures that a failure in one host does not impact unrelated services.
+
+---
+
+**See also:**
+
+- [Concept: Security model](/root/concepts/security-model)
+- [Concept: Tiered storage](/root/concepts/tiered-storage)