Ember CLI Deploy S3 Index Plugin

This plugin for Ember CLI Deploy specializes in uploading the `index.html` (bootstrap) file of an Ember application to an Amazon S3 bucket. It is commonly used as part of the 'lightning method' of deployment, where both application assets and the index file are served from S3. The current stable version is 4.0.3, with recent bug fixes focusing on robust S3 response handling, including 'NotFound' and empty responses. It integrates into the `ember-cli-deploy` pipeline, implementing `configure`, `upload`, `activate`, and `fetchRevisions` hooks. It's actively maintained with a moderate release cadence addressing bug fixes and minor enhancements, distinguishing itself by managing *only* the index file, often alongside `ember-cli-deploy-s3` which handles other application assets.