deps: update eslint to be able to use esm-only eslint github plugin

Author: owlstronaut

.eslint.config.js

@@ -0,0 +1,14 @@
+import github from 'eslint-plugin-github'
+
+export default [
+  // React config from github plugin
+  github.getFlatConfigs().react,
+  
+  // Core configuration
+  {
+    ignores: ['.cache/**', 'public/**'],
+    linterOptions: {
+      reportUnusedDisableDirectives: true
+    }
+  }
+]

.eslintrc.js

@@ -3,14 +3,13 @@ const {getGlobals} = require('eslint-plugin-mdx')
 module.exports = {
   root: true,
   ignorePatterns: ['.cache/', 'public/'],
-  plugins: ['primer-react', 'github'],
+  plugins: ['primer-react'], // github plugin now comes from flat config
   extends: [
     '@npmcli',
     'react-app',
-    // 'react-app/jest',
     'eslint:recommended',
     'plugin:react/recommended',
-    'plugin:github/react',
+    // 'plugin:github/react',  // REMOVED: now handled by flat config
     'plugin:react-hooks/recommended',
     'prettier',
   ],