chore: upgrade ruby/node and setup local development

- [x] devcontainer
- [x] upgrade ruby (was 3.3.1, now 3.3.3)
- [x] upgrade node (was 12, now 23)
- [x] update README

Signed-off-by: jmeridth <[email protected]>

Author: jmeridth

.devcontainer/devcontainer.json

@@ -0,0 +1,14 @@
+{
+  "name": "mcl",
+  "image": "mcr.microsoft.com/vscode/devcontainers/jekyll",
+  "features": {
+    "ghcr.io/devcontainers/features/node:1": {
+      "version": "23.3.0"
+    },
+    "ghcr.io/devcontainers/features/ruby:1": {
+      "version": "3.3.6"
+    }
+  },
+  "forwardPorts": [4000],
+  "postCreateCommand": "bundle exec jekyll serve --watch --incremental --baseurl ''"
+}

.node-version

@@ -1 +1 @@
-12.14.0
+23.3.0

.ruby-version

@@ -1 +1 @@
-3.1.0
+3.3.6

README.md

@@ -39,6 +39,10 @@ To start up the local Jekyll server run:
 
 Now point your browser to <http://localhost:4000> to view the site.
 
+### Devcontainer
+
+This project includes a `.devcontainer` folder with a `Dockerfile` and `devcontainer.json` to use with [Visual Studio Code Remote - Containers](https://code.visualstudio.com/docs/remote/containers). This will set up a development environment with all the necessary dependencies.
+
 ### Note on Patches/Pull Requests
 
 * Fork the project.