Update Operating Systems category

- Linux distributions that explicitly banned LLM/GenAI contributions are placed in a separate alternatives subsection.
- Removed mention of Gentoo's USE flags because it felt like unnecessary pressure.

Add Elementary and Chimera Linux Distributions as Alternatives
- Closes #433

Co-authored-by: reece146 <reece146@noreply.codeberg.org>

README.md

@@ -673,7 +673,10 @@ This is a section for repos that are similar to this one either because they are
 > * [illumos](https://illumos.org/) and its distributions remain unaffected as of April 2026.
 > * [RedoxOS](https://redox-os.org/) has [banned LLMs](https://gitlab.redox-os.org/redox-os/redox/-/blob/master/CONTRIBUTING.md)
 > * [Haiku](https://www.haiku-os.org/) has [banned LLMs](https://www.haiku-os.org/community/organization/policies/)
-> * [Gentoo Linux](https://www.gentoo.org/) **is a compromise** since it uses the Linux kernel; however, Gentoo has [banned LLMs](https://wiki.gentoo.org/wiki/Project:Council/AI_policy) and its USE flags can be useful for disabling optional ai-tainted dependencies.
+> ##### Linux kernel-based distributions that explicitly ban LLM/GenAI contributions.
+> * [Chimera Linux](https://chimera-linux.org/) has [banned LLMs](https://github.com/chimera-linux/chimera-linux.github.io/blob/4d7dee4c389e7d18f52b35da5b0eb016d17dd03d/community/index.md#contributing)
+> * [elementary OS](https://elementary.io/) has [banned LLMs](https://docs.elementary.io/contributor-guide/development/generative-ai-policy)
+> * [Gentoo Linux](https://www.gentoo.org/) has [banned LLMs](https://wiki.gentoo.org/wiki/Project:Council/AI_policy)
 
 ## Networking