Merge pull request #16 from cNikolaou/frontend_format_lint

Add Prettier and ESLint to format and lint `frontend/`

.git-blame-ignore-revs

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+# ignore changes made by formatting with Prettier
+ff38a0d24eab8b96a555c91793b2a7ea8401aada

frontend/.prettierrc.yaml

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+semi: true
+singleQuote: true
+tabWidth: 2
+trailingComma: 'es5'

frontend/eslint.config.js

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+import pluginJs from '@eslint/js';
+import pluginVue from 'eslint-plugin-vue';
+import eslintConfigPrettier from 'eslint-config-prettier';
+
+export default [
+  pluginJs.configs.recommended,
+
+  ...pluginVue.configs['flat/essential'],
+
+  eslintConfigPrettier,
+
+  {
+    files: ['**/*.{js,mjs,cjs,vue}'],
+
+    rules: {
+      'no-unused-vars': 'warn',
+      'no-extra-boolean-cast': 'warn',
+    },
+  },
+
+  {
+    files: ['**/*.vue'],
+    rules: {
+      'vue/require-v-for-key': 'warn',
+      'vue/multi-word-component-names': 'warn',
+      'vue/no-side-effects-in-computed-properties': 'warn',
+    },
+  },
+];