Add mkdocs to the Nix shell

installer/nix/flake.lock

@@ -1,12 +1,15 @@
 {
   "nodes": {
     "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
       "locked": {
-        "lastModified": 1659877975,
-        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "lastModified": 1701680307,
+        "narHash": "sha256-kAuep2h5ajznlPMD9rnQyffWG8EM/C73lejGofXvdM8=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "rev": "4022d587cbbfd70fe950c1e2083a02621806a725",
         "type": "github"
       },
       "original": {
@@ -17,16 +20,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659446231,
-        "narHash": "sha256-hekabNdTdgR/iLsgce5TGWmfIDZ86qjPhxDg/8TlzhE=",
+        "lastModified": 1703992652,
+        "narHash": "sha256-C0o8AUyu8xYgJ36kOxJfXIroy9if/G6aJbNOpA5W0+M=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "eabc38219184cc3e04a974fe31857d8e0eac098d",
+        "rev": "32f63574c85fbc80e4ba1fbb932cde9619bad25e",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-21.11",
+        "ref": "nixos-23.11",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -36,6 +39,21 @@
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",

installer/nix/flake.nix

@@ -2,7 +2,7 @@
   description = "nimbus-eth2";
 
   inputs = {
-    nixpkgs.url = github:NixOS/nixpkgs/nixos-21.11;
+    nixpkgs.url = github:NixOS/nixpkgs/nixos-23.11;
     flake-utils.url = github:numtide/flake-utils;
   };
 
@@ -12,4 +12,4 @@
       name = "nimbus-eth2";
       shell = ./shell.nix;
     };
-}
+}

installer/nix/shell.nix

@@ -1,4 +1,13 @@
 { pkgs ? import <nixpkgs> {}}:
+let
+  mkdocs-packages = ps: with ps; [
+    mkdocs
+    mkdocs-material
+    mkdocs-material-extensions
+    pymdown-extensions
+  ];
+  mkdocs-python = pkgs.python3.withPackages mkdocs-packages;
+in
 with pkgs;
 mkShell {
 
@@ -14,8 +23,7 @@ mkShell {
     killall # for killing processes manually
     curl    # for working with the node APIs
 
-    python3
-    mdbook
+    mkdocs-python
   ] ++ lib.optionals (!stdenv.isDarwin) [
     lsb-release
   ];