Updating highlight groups

[jthvai]

As this repository is no longer maintained, and the tree-sitter highlight groups have gone through not only one but two breaking changes, I've rewritten this colorscheme - available at codeberg.org/jthvai/lavender.nvim.

I've deviated from moonlight in a few of the syntax highlighting choices, as I got used to using moonlight with the fallback highlights (while TS wasn't working) without realising, and I thought they looked better.

[gokayburuc]

Add SnacksBackdrop Support for highlights.

After Neovim started working with Snacks plug, it stopped supporting Telescope highlight builds. That's why when i started my Neovim with your theme getting this annoying black stripe.

Personally, I could change the highlights and fix this issue, but it's not the best option for beginners. Also, for users of AstroNvim, like Nvim Distro, the snacks.nvim plugin is a must.