I love the style that was implemented for https://old.lemmy.world and https://old.lemmy.sdf.org. Are there any plans to add something similar for this instance? (Not sure if an old subdomain is the right choice for this, since there is already a theme selection in the profile settings.)
https://mlmym.org/ can be used for any instance, its just that the lemmy.world people put up their own copy but in single instance mode. The site is ran by the developers of the theme from what I can tell ( its linked to from their github page)
since lemmy.ml is your home instance thats what you'd enter there on that first page