DEV: Update linting (#4)

.eslintrc.cjs

@@ -0,0 +1 @@
+module.exports = require("@discourse/lint-configs/eslint-theme");

.github/workflows/discourse-theme.yml

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+name: Discourse Theme
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  ci:
+    uses: discourse/.github/.github/workflows/discourse-theme.yml@v1

.gitignore

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+node_modules
+.discourse-site

.prettierrc.cjs

@@ -0,0 +1 @@
+module.exports = require("@discourse/lint-configs/prettier");

.template-lintrc.cjs

@@ -0,0 +1 @@
+module.exports = require("@discourse/lint-configs/template-lint");

package.json

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+{
+  "private": true,
+  "devDependencies": {
+    "@discourse/lint-configs": "^1.3.7",
+    "ember-template-lint": "^5.13.0",
+    "eslint": "^8.56.0",
+    "prettier": "^2.8.8"
+  }
+}