Updated display of "loading" spinner

Updated the display of the “loading” spinner when changing the post
author.
Added plugin version number to style hook

Added the plugin’s version number to the style hook.
Clarified explanation

Clarified the explanation of the scope of the information placed in the
fields.
Added plugin version

Added the plugin version to the script hook.
Corrected "Update Profile" code

Corrected the check and execution for updating the author’s user
profile with the post author data.
Renamed JavaScript file

Renamed file from ‘change-post-author.js’ to ‘edit-post.js’
Renamed JavaScript file

Renamed file from ‘change-post-author.js’ to ‘edit-post.js’
Restructured "loading" spinner display

Restructured the HTML that renders the “loading” spinner
Added variable for plugin version

Added an ENV variable for the plugin version to be used elsewhere in
the plugin.