message: Meta: don't show `index` among the features in the options page
  Fixes
diff: @@ -38,7 +38,7 @@ function parseFeatureDetails(id: FeatureID): FeatureMeta {
  function getFeatures(): FeatureID[] {
  return readdirSync(path.join(__dirname, 'source/features'))
  - .filter(filename => filename.endsWith('.tsx'))
  + .filter(filename => filename !== 'index.tsx' && filename.endsWith('.tsx'))
  .map(filename => filename.replace('.tsx', '') as FeatureID);
  }
  