Ok, this is embarrassing. I created an infinite loop on every page using the following rewrite rule:
add_rewrite_rule('.', 'home/', 'top');
I have no idea how to undo it, as every page, including settings pages, now give me a 500 error. Any idea how to fix it?
.htaccess
on the root of the website.htaccess
file contains the rules themselves! Thanks for pointing me in that direction!