You could get rid of the following items, if you want, but your list doesn't look too bad to me.

shower cap for helmet cover
sneakers

1 pots
collapsible bowl

folding spoon for cooking
small plate
2 Platypus bags (had to use both a couple times) - if you need extra water, buy it in one or two litre bottles, keep & refill until no longer needed then discard/recycle.

cutting board - i use a flexible plastic sheet cut to fit my front (food) pannier


sleeping mat - yes you can too sleep without it
small couch pillow - yes your clothes in a stuff sack do cut it
silk liner - unless your bag is too cold, just wear your fleece & thermals in the bag
clothes pins - girth hitch your clothes around the rope

deodorant

first aid kit = advil, a couple of bandaids, neosporin, a couple of leftover serious painkillers. If you are hurt really bad you're going to need a doctor anyway, so you can buy that stuff later.