**Title:** ✨ Integrated Seigr OS as the Native OS for the Ecosystem

**Description:**
- Introduced **Seigr OS (Nittedalsmarka)** as the official operating system for the Seigr Ecosystem.
- Renamed `README.md` to `pokyREADME.md` to preserve original Poky documentation.
- Created a **new Seigr-aligned README.md**, detailing our vision, modularity, and future roadmap.
- Ensured correct build setup and directory structure for **BitBake and Yocto** integration.
- Established **Seigr OS branch structure**, replacing `kirkstone` with **`Nittedalsmarka`** for future releases.

🚀 **Seigr OS is now officially part of the Seigr Ecosystem!**