switch to mdboko-alerts from nixpkgs

flake.nix

@@ -18,8 +18,7 @@
         pkgs = import nixpkgs {
           inherit system;
         };
-        mdbook-alerts = pkgs.callPackage ./mdbook-alerts.nix { };
-        package = pkgs.callPackage ./default.nix { inherit mdbook-alerts; };
+        package = pkgs.callPackage ./default.nix { };
         app = pkgs.writeShellScriptBin "app" ''
           trap 'kill "''${child_pid}"; wait "''${child_pid}";' SIGINT SIGTERM
           ${pkgs.merecat}/bin/merecat -n -p 8080 ${package}/share/web &
@@ -32,11 +31,11 @@
         devShells.default = pkgs.mkShell {
           packages = [
             pkgs.mdbook
-            mdbook-alerts
+            pkgs.mdbook-alerts
           ];
         };
         packages = {
-          inherit app mdbook-alerts;
+          inherit app;
           default = package;
         };
       }

mdbook-alerts.nix

@@ -1,23 +0,0 @@
-{ lib, fetchFromGitHub, rustPlatform }:
-
-rustPlatform.buildRustPackage rec {
-  pname = "mdbook-alerts";
-  version = "0.5.2";
-
-  src = fetchFromGitHub {
-    owner = "lambdalisue";
-    repo = "rs-mdbook-alerts";
-    rev = "v${version}";
-    hash = "sha256-YlCvsDdWuoajuXt2hOGx7jW+lmLeMOSQ809bG9ZBaBY=";
-  };
-
-  cargoHash = "sha256-OuZo8QTE5Z1991S5CEkfxlXghQbnalt1UGNs4KozmEk=";
-
-  meta = with lib; {
-    description = "mdBook preprocessor to add GitHub Flavored Markdown's Alerts to your book";
-    mainProgram = "mdbook-alerts";
-    license = licenses.mit;
-    maintainers = with maintainers; [ adtya ];
-    homepage = "https://github.com/lambdalisue/rs-mdbook-alerts";
-  };
-}