Remove vue-cli dependencies

This started with an attempt to upgrade Astro to v3.0
- Astro v3.0 no longer supports Node 16. We need to upgrade our tooling
  to Node 18. See https://docs.astro.build/en/guides/upgrade-to/v3/#removed-support-for-node-16
- vue-cli contains a dependency that is not compatible with Node 18
  (@achrinza/node-ipc@9). See vuejs/vue-cli#7116

This compatible issue has been fixed but Centrapay Docs does not need
vue-cli and the module itself is in maintenance mode. See https://cli.vuejs.org/

Removing these vue-cli dependencies required a change to use eslint
directly for linting instead. We are now using eslint-plugin-vue (it was
already installed) as per Vue's official guidelines. See https://vuejs.org/guide/scaling-up/tooling.html#linting

I've also added init: true to the docker compose config to forward signals correctly.

Test plan:
- Confirm Eslint is linting Vue files using its --debug flag
- Confirm that the local dev server runs correctly
- Confirm that the static Centrapay Docs site builds correctly
- Confirm the site navigation still works

Author: tom-blake

docker-compose.yml

@@ -3,6 +3,7 @@ version: "3"
 services:
   app:
     image: node:16
+    init: true
     working_dir: /work
     volumes: [ ".:/work" ]
     command:
@@ -14,12 +15,14 @@ services:
       - "ENV=development"
   legacy:
     image: ruby:2.7
+    init: true
     working_dir: /work/legacy
     volumes: [ ".:/work" ]
     command: "bundle exec jekyll serve --livereload --host=0.0.0.0"
     ports: [ "4000:4000", "35729:35729" ]
   script:
     image: node:16
+    init: true
     working_dir: /work
     stop_signal: SIGKILL
     volumes: [ ".:/work" ]
@@ -32,6 +35,7 @@ services:
         docker-compose run script {command}"
   ruby-script:
     image: ruby:2.7
+    init: true
     working_dir: /work/legacy
     volumes: [ ".:/work" ]
     stop_signal: SIGKILL

package.json

@@ -1,7 +1,7 @@
 {
   "private": true,
   "scripts": {
-    "lint": "vue-cli-service lint --max-warnings 0 --no-fix .",
+    "lint": "eslint --ext .js,.mjs,.ts,.vue .",
     "dev": "astro dev",
     "build": "astro build",
     "preview": "astro preview",
@@ -16,8 +16,6 @@
     "@fontsource/inter": "^4.5.15",
     "@headlessui/vue": "^1.6.0",
     "@tailwindcss/typography": "^0.5.8",
-    "@vue/cli-plugin-eslint": "~4.5.0",
-    "@vue/cli-service": "~4.5.0",
     "astro": "^2.0.11",
     "eslint": "^7.20.0",
     "eslint-plugin-cypress": "^2.11.2",