Add layout support for RTL languages
The manual has been translated into Persian but the layout is still left-to-right.
Adding dir="rtl" to the html element doesn't fix this, as it causes the ToC sidebar to overlay the content.
Setting direction: rtl on the toc and wrapper divs, and then somehow conditionally styling the images to float left rather than right, may work.
Whatever solution we find, we need to be able to trigger it conditionally in the Hugo template based on the .Site.Language.LanguageDirection parameter: