Config option to insert new item at start of list

[siahgoodwork]

In our use case, on certain content displays it is useful to have new items appear at the start of the list by default, instead of the end as it is currently.

I also added a button to push item to the start on the "Toggle Increment" buttons.

[SimeonGriggs]

Hey @siahgoodwork good idea.

1. Could you update the README to include instructions on how to use this
2. Consider instead of newItemAtStart, a more generic newItemPosition which defaults to after and can be set to before | after

[siahgoodwork]

Hi @SimeonGriggs I notice the logic is already modified to your suggestion after doing an edit on my end 🤣
Have added a bit on the README to document this option and kept the logic that's already on main which is more elegant.