A minor content update

I finally released this game because I thought I was done with it (ha ha) but having people play it motivated me to finally add some more plants, roughly doubling it. There are now more ways to win! And more ways to lose...

Also, I added a minor QOL feature I totally forgot to add in before, which is, instead of silently failing when you try to pick a plant that's already in your inventory, you get a message telling you that you already have it.