I like gruvbox, because it improves the readability a lot!
Though the bare scheme does not match all my expectations, therefore I
added some more settings in the muttrc. The scheme itself came from the
official neomutt page.
Furthermore this change fixes the display of the date and the overall
preview to a easier to read format.
Reference: https://www.sthu.org/code/codesnippets/mutt-gruvbox.html
Some mails are just stupidly hard to parse, especially if the HTML
contains dozens of images. Kununu even managed to include the same
amount of images into the text-mails with all their marketing foo in the
URL. So, since these were so hard to understand I needed multiple
different "grades" of URL lists. This change allow be to choose between
different views.