Recent treesitter updates broke some things

[nocksock]

nvim 0.8 gives some basic highlight groups like @function which made the TS* highlight groups obsolete and got removed recently - which breaks a bunch of existing themes that use those groups, including this one.

There's a workaround to make broken themes work for the time being: nvim-treesitter/nvim-treesitter@42ab95d#commitcomment-87014462

Also lush.nvim also introduced a way to define these groups: rktjmp/lush.nvim#109

I will look into fixing it this evening, hopefully.