Full Width Wikipedia

Remove the new Wikipedia style to use the previous/historical full sized version.

Since August 2020 a new design have been adopted by some branches of Wikimedia, and therefore Wikipedia. This new design aim to reduce content line-lenght, but do it mostly in a way I, and according to the Wikipedia discussion page a lot of peoples, consider counter productive and harmful. This extension provide a simple way to restore the previous and historical apparence by removing the new attributes (HTML classes) in the page.