JS: Upated npm deps, upgraded eslint, new eslint config

Upgraded eslint to 11, removed incompatible airbnb config as part of
process. ESlint config now in its own file.

package.json

@@ -19,36 +19,36 @@
     "test": "jest"
   },
   "devDependencies": {
+    "@eslint/js": "^9.21.0",
     "@lezer/generator": "^1.7.2",
     "@types/sortablejs": "^1.15.8",
     "chokidar-cli": "^3.0",
-    "esbuild": "^0.24.0",
-    "eslint": "^8.57.1",
-    "eslint-config-airbnb-base": "^15.0.0",
+    "esbuild": "^0.25.0",
+    "eslint": "^9.21.0",
     "eslint-plugin-import": "^2.31.0",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",
     "livereload": "^0.9.3",
     "npm-run-all": "^4.1.5",
-    "sass": "^1.82.0",
-    "ts-jest": "^29.2.5",
+    "sass": "^1.85.0",
+    "ts-jest": "^29.2.6",
     "ts-node": "^10.9.2",
     "typescript": "5.7.*"
   },
   "dependencies": {
-    "@codemirror/commands": "^6.7.1",
+    "@codemirror/commands": "^6.8.0",
     "@codemirror/lang-css": "^6.3.1",
     "@codemirror/lang-html": "^6.4.9",
-    "@codemirror/lang-javascript": "^6.2.2",
+    "@codemirror/lang-javascript": "^6.2.3",
     "@codemirror/lang-json": "^6.0.1",
-    "@codemirror/lang-markdown": "^6.3.1",
+    "@codemirror/lang-markdown": "^6.3.2",
     "@codemirror/lang-php": "^6.0.1",
     "@codemirror/lang-xml": "^6.1.0",
-    "@codemirror/language": "^6.10.6",
-    "@codemirror/legacy-modes": "^6.4.2",
-    "@codemirror/state": "^6.5.0",
+    "@codemirror/language": "^6.10.8",
+    "@codemirror/legacy-modes": "^6.4.3",
+    "@codemirror/state": "^6.5.2",
     "@codemirror/theme-one-dark": "^6.1.2",
-    "@codemirror/view": "^6.35.2",
+    "@codemirror/view": "^6.36.3",
     "@lezer/highlight": "^1.2.1",
     "@ssddanbrown/codemirror-lang-smarty": "^1.0.0",
     "@ssddanbrown/codemirror-lang-twig": "^1.0.0",
@@ -59,86 +59,5 @@
     "markdown-it-task-lists": "^2.1.1",
     "snabbdom": "^3.6.2",
     "sortablejs": "^1.15.6"
-  },
-  "eslintConfig": {
-    "root": true,
-    "env": {
-      "browser": true,
-      "es2021": true
-    },
-    "extends": "airbnb-base",
-    "ignorePatterns": [
-      "resources/**/*-stub.js",
-      "resources/**/*.ts"
-    ],
-    "overrides": [],
-    "parserOptions": {
-      "ecmaVersion": "latest",
-      "sourceType": "module"
-    },
-    "rules": {
-      "indent": [
-        "error",
-        4
-      ],
-      "arrow-parens": [
-        "error",
-        "as-needed"
-      ],
-      "padded-blocks": [
-        "error",
-        {
-          "blocks": "never",
-          "classes": "always"
-        }
-      ],
-      "object-curly-spacing": [
-        "error",
-        "never"
-      ],
-      "space-before-function-paren": [
-        "error",
-        {
-          "anonymous": "never",
-          "named": "never",
-          "asyncArrow": "always"
-        }
-      ],
-      "import/prefer-default-export": "off",
-      "no-plusplus": [
-        "error",
-        {
-          "allowForLoopAfterthoughts": true
-        }
-      ],
-      "arrow-body-style": "off",
-      "no-restricted-syntax": "off",
-      "no-continue": "off",
-      "prefer-destructuring": "off",
-      "class-methods-use-this": "off",
-      "no-param-reassign": "off",
-      "no-console": [
-        "warn",
-        {
-          "allow": [
-            "error",
-            "warn"
-          ]
-        }
-      ],
-      "no-new": "off",
-      "max-len": [
-        "error",
-        {
-          "code": 110,
-          "tabWidth": 4,
-          "ignoreUrls": true,
-          "ignoreComments": false,
-          "ignoreRegExpLiterals": true,
-          "ignoreStrings": true,
-          "ignoreTemplateLiterals": true
-        }
-      ]
-    }
   }
 }