[UserScript] Lemmy Style Cleanup

A good chunk of this was borrowed from another thread by @mershed_perderders@sh.itjust.works at https://sh.itjust.works/post/70273 but I've also added:

• clickable comment headers
• big friendly up/down vote buttons for posts
• rearranged comment up/down vote buttons and More button to shift things to be more visually pleasing (to me anyway)