seems better to use ruby over node in dev.

.devcontainer/devcontainer.json

@@ -1,9 +1,9 @@
 // For format details, see https://aka.ms/devcontainer.json. For config options, see the
 // README at: https://github.com/devcontainers/templates/tree/main/src/alpine
 {
-	"name": "Node.js",
+	"name": "Ruby",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/javascript-node:20"
+	"image": "mcr.microsoft.com/devcontainers/ruby"
 
 	// Features to add to the dev container. More info: https://containers.dev/features.
 	// "features": {},

Gemfile

@@ -0,0 +1,6 @@
+source "https://rubygems.org"
+git_source(:github) { |repo| "https://github.com/#{repo}.git" }
+
+gem "puma"
+gem "rackup"
+gem "sinatra"

Gemfile.lock

@@ -0,0 +1,39 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    base64 (0.2.0)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
+    nio4r (2.7.1)
+    puma (6.4.2)
+      nio4r (~> 2.0)
+    rack (3.0.10)
+    rack-protection (4.0.0)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
+    rackup (2.1.0)
+      rack (>= 3)
+      webrick (~> 1.8)
+    ruby2_keywords (0.0.5)
+    sinatra (4.0.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.0.0)
+      rack-session (>= 2.0.0, < 3)
+      tilt (~> 2.0)
+    tilt (2.3.0)
+    webrick (1.8.1)
+
+PLATFORMS
+  ruby
+  x86_64-linux
+
+DEPENDENCIES
+  puma
+  rackup
+  sinatra
+
+BUNDLED WITH
+   2.5.3

README.md

@@ -4,8 +4,10 @@ This is the source code for the Boston Ruby Group website: https://www.bostonrub
 
 ## Local development
 
-* npm install
-* npm start
+* bundle
+* ruby app.rb
+
+Note that ruby is only used in local development.
 
 ## Deployment
 

app.rb

@@ -0,0 +1,8 @@
+require 'rubygems'
+require 'sinatra'
+
+set :public_folder, 'docs'
+
+get '/' do
+  File.read(File.join('docs', 'index.html'))
+end