This script changes a WordPress database. Make a backup!

The script first looks for uploaded images without alt text. A link of
each image is sent to OpenAI to get a description of the image. This
text is saved in wp_postmeta.

The script then looks for posts/pages with <img> tags with missing alt
text. If the image name plus an alt text is found in the WordPress
database, the alt attribute is added to both post_content (HTML) and
post_content_filtered (Markdown).

This script is only tested for sites which use the Jetpack Markdown
editor. Use at your own risk!!
