alexandria: package and enable tt-rss readability plugin

packages/tt-rss-plugin-af-readability.nix

@@ -0,0 +1,33 @@
+{ ... }:
+
+{
+  perSystem =
+    { pkgs, ... }:
+    {
+      packages.tt-rss-plugin-af-readability = pkgs.stdenv.mkDerivation {
+        pname = "tt-rss-plugin-af-readability";
+        version = "unstable-2025-10-16";
+
+        src = pkgs.fetchFromGitHub {
+          owner = "tt-rss";
+          repo = "tt-rss-plugin-af-readability";
+          rev = "fce528aa69c2a7193fb7eb3a3cd9dd17885d6ab6";
+          hash = "sha256-3rxrICtm6+ujlBHj5Su2sSEq3lgiHhQMJ/OVfzhzYXA=";
+        };
+
+        installPhase = ''
+          mkdir -p $out/af_readability
+
+          cp -a * $out/af_readability/
+        '';
+
+        meta = {
+          description = "Plugin for TT-RSS to inline article content using Readability";
+          license = pkgs.lib.licenses.gpl3;
+          homepage = "https://github.com/tt-rss/tt-rss-plugin-af-readability/";
+          maintainers = with pkgs.lib.maintainers; [ gdamjan ];
+          inherit (pkgs.tt-rss.meta) platforms;
+        };
+      };
+    };
+}