Generic Index Feed with Infinite Scrolling with auto-fetching. It takes the index parameters to fetch items from the given index and a method to render a single item. Props: - `index` - an object with `action`, `key`, `options` fields. Similar to args of `Social.index(action, key, options)` call. - `renderItem` - a method to render a single item from the index. It should return a rendered react component with a unique key for this item.