flake update

hm-modules/helix.nix

@@ -22,6 +22,7 @@ in
         # nodePackages_latest.prettier
         dprint
         markdown-oxide
+        codebook
         ## python
         # ruff-lsp
         # nodePackages_latest.pyright
@@ -142,6 +143,10 @@ in
         language-server.csharp = {
           command = "csharp-language-server";
         };
+        language-server.codebook = {
+          command = "codebook-lsp";
+          args = ["serve"];
+        };
         language = flatten [
           (map
             (x: {
@@ -173,6 +178,10 @@ in
               "ruff"
             ];
           }
+          {
+            name = "markdown";
+            language-servers = ["codebook"];
+          }
           {
             name = "c-sharp";
             language-servers = [ "csharp" ];