Find Alternative for NodeJS Batch Processor

[Pen-a11y]

At the moment we use a processor with NodeJS that when given a call checks to see if there is alt text available for the image.

This task is to find a solution to this, such as creating an AJAX call within the setting page of wordpress.

[jkva]

The tricky issue here is that we would rely on a slow WPEngine instance with large database - think Cooper-Hewitt - so we can properly simulate the conditions that previously required these measures.