[User-Guiding] Extend the "home" button sytle to guide user back to oep website #75
Description
Recently I saw a user interface created by GitHub that takes the user from an external page back to the "GitHub home page". I'm posting this here as inspiration, as I'm not entirely happy with our current approach of inserting the link to OpenEnergyPlatform into the home button of the mkdocs pages, which normally takes you back to the home page of the current website.
We can modify the style to have something similar.
