Using entity title for aria-label results in confusing labels.

Problem/Motivation

Naming the flourish entity in the CMS so it can easily be found in the media library might not give the most useful aria label, and can cause confusion for users using a screen reader.

Proposed resolution

Remove the aria-label attribute altogether. On div's, it's not recommended to use it without an accompanying role https://w3c.github.io/using-aria/#well-supported-elements and flourish provides other accessibility such as title on the iframe, as well as a text field to describe the graph (see: https://flourish.studio/blog/accessible-visualization-screenreader-descr... ). I think these will provide enough information.