docs: update README.md

profile/README.md

@@ -18,8 +18,8 @@ We are [Determinate Systems](https://determinate.systems).
 We regularly write about what we're working on; here are some recent blog posts:
 
 
+- [End of life for the free tier of the Magic Nix Cache](https://determinate.systems/posts/magic-nix-cache-free-tier-eol/) (today)
 - [Changelog: customer binding, nix.conf, and yanked Nix 2.25.4](https://determinate.systems/posts/changelog-determinate-nix-030/) (1 week ago)
 - [Determinate Nix now supports migrating from other caches](https://determinate.systems/posts/flakehub-cache-migration/) (1 month ago)
 - [The future of software is Nix](https://determinate.systems/posts/the-future-is-nix/) (2 months ago)
 - [Nix at work: FlakeHub Cache and private flakes](https://determinate.systems/posts/flakehub-cache-and-private-flakes/) (3 months ago)
-- [Announcing Determinate Nix](https://determinate.systems/posts/announcing-determinate-nix/) (3 months ago)