Fix/palette spelling

[EdenEast]

I cant spell... pallet is also a word and spell check did not save me. Oh well here is a large pr to fix it. Sorry everyone for the deprecation.

BREAKING CHANGE: Renamed pallet to correct spelling palette

Fixes: #106

[pmrt]

Please, @EdenEast make a pinned issue with all the breaking changes listed and do not suddenly remove old APIs, but add a warning (with vim.notify or something like that) with a deprecated notice like other plugins do. I just spent 1 hour or more figuring out this issue.

Anyway, thanks for your work on this theme, it's awesome.

[EdenEast]

There is a check that prints a deprecation warning on first load here. Did this not show up for you?

[pmrt]

Oh, I definitely must have missed that! May I suggest to use vim.notify like nvim-tree and LSP?

https://github.com/neovim/neovim/blob/c5720c72213810adb75d3277ac645eb6fc8dafa8/runtime/lua/vim/lsp.lua#L1092-L1098

It is more visible than nvim_echo and more appropriate for this use case IMO. Also, I love when plugins provide a pinned issue with breaking changes: hrsh7th/nvim-cmp#231 because that way people can subscribe to them.

Btw, this is a different issue but speaking of spelling, I think it is deprecation not deprication:) - https://github.com/EdenEast/nightfox.nvim/blob/63a8eb6/lua/nightfox/util/deprication.lua

Sorry for the off-topic.