Content updates!

This is my oldest generator, and was due for some love; I've updated the about page and the font, made both the Valentine's and Halloween generators available year-round (I never remember to change them seasonally, so this is for the best), and - most exciting - plenty of new additions to the arrays, meaning new prompts!

No new prompt categories, but I have added a bunch of new back-end prompt architecture, since it was originally quite simple and now I know that if I want I can prompt you 'space pirates' or 'noir pirates' or 'cyberpunk pirates' and do a lot of other interesting little tweaks. And I've added wholly new prompts to the arrays as well, so there's lots of new content in there.