comp review todo app update (#146)

* new todo frontend

* yarn --> npm

* basic Dockerfile

* add Helm chart for todo list

* backend working

* connect new-app'd frontend to backend via proxy_pass

* move nginx conf

* move nginx conf back

* move helm chart to course repo

* add simple SSR node.js service

* log error message

* fix host typo

* fix dockerfiles

* add link to items page

* improve probe route for todo-backend

* canary probe route for todo-backend

* Dockerfile -> Containerfile todo-backend

* Dockerfile -> Containerfile todo-frontend

* remove commands for containerfile as part of comp review

todo-ssr/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "todo-ssr",
+  "private": true,
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "axios": "^0.21.1",
+    "express": "^4.17.1",
+    "pug": "^3.0.2"
+  }
+}