POC for Versions being updated from the ReleaseRegistry

Any Cody block which has {CURRENT_VERSION} will be replaced by the
latest release from the ReleaseRegistry.
This PR also fixes the PreCodeBlock component, which previously didn't
really work at all. The copy function was broken, and the children check
didn't do anything (child is never of type string in react)

Up next is cleaning up the Versions file (it'll be removed)
And then replacing all hard coded versions with the same process is the
POC. Then we'll also need some automation which deploys / builds the
website at release time since the release version gets determined at
compile time rather than client time.

Author: Chickensoupwithrice

docs/cody/flake.nix

@@ -0,0 +1,17 @@
+{
+  description = "A basic flake with a shell";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs =
+    { nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShells.default = pkgs.mkShell { packages = [ pkgs.nodejs pkgs.pnpm ]; };
+      }
+    );
+}

flake.nix

@@ -0,0 +1,17 @@
+{
+  description = "A basic flake with a shell";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs =
+    { nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShells.default = pkgs.mkShell { packages = [ pkgs.nodejs pkgs.pnpm ]; };
+      }
+    );
+}

package.json

@@ -15,6 +15,7 @@
 		"@docsearch/react": "3",
 		"@headlessui/react": "^1.7.13",
 		"@heroicons/react": "^2.0.18",
+		"@mdx-js/mdx": "^3.0.1",
 		"@next/third-parties": "^14.1.4",
 		"@radix-ui/react-hover-card": "^1.1.1",
 		"@radix-ui/react-select": "^2.0.0",
@@ -37,13 +38,15 @@
 		"js-yaml": "^4.1.0",
 		"kbar": "^0.1.0-beta.44",
 		"lucide-react": "^0.372.0",
+		"mdx": "^0.3.1",
 		"next": "^14.2.3",
 		"next-contentlayer": "^0.3.4",
 		"next-themes": "^0.2.1",
 		"prism-react-renderer": "^2.0.6",
 		"react": "18.3.1",
 		"react-dom": "18.3.1",
 		"react-highlight-words": "^0.20.0",
+		"react-syntax-highlighter": "^15.5.0",
 		"rehype-autolink-headings": "^7.1.0",
 		"rehype-pretty-code": "^0.10.2",
 		"rehype-slug": "^6.0.0",