The README mentions that this depends on Lush, but it would also be helpful to mention that this means it depends on at least Neovim 0.5, which is not yet released.

With Vim being such a critical tool for developers, some will not be interested to rely on an unreleased version of their text editor.

The LSP error colours are white and not red.

Is there something I need to configure to change this default behaviour or is this is the only option for now?

As title. hl-VertSplit is deprecated and has been renamed to hl-WinSeparator.

I'm not familiar with lush and do not know if they are up to date, but it will be nice if you could define hl-WinSeparator or add something equivalent to :hi default link WinSeparator VertSplit.

https://neovim.io/doc/user/deprecated.html#_highlights

Thanks in advance.

I am using gitsigns-nvim to mark lines as added, deleted or changes.
With jellybeans-nvim signs are always gray:

Here 187 line is added, 192 and below are changed.

Add something like vim.opt.termguicolors = true to the README.md because without it, the colorscheme doesn't work. Took me a second to find what wasn't working for me lol.

I tried to change some colors but don't know how to do this.
Following the suggestions in lush, i.e. replacing harbour with jellybeans-nvim in the pasted code below didn't work

-- ~/.config/nvim/colors/my-harbour.lua
-- See create.md and rktjmp/lush-template for more details on what can go in this file.

vim.opt.background = 'dark'
vim.g.colors_name = 'my-harbour'

-- First we will need lush, and the colorscheme we wish to modify
local lush = require('lush')
local harbour = require('lush_colorscheme.harbour')

-- Now we will extend the colorscheme
local spec = lush.extends({harbour}).with(function()
  return {
    -- make the telescope popup look like the pmenu
    TelescopeNormal { harbour.Pmenu },
    -- you can now use TelescopeNormal just like any other group (ref, inherit, etc)
    TelescopeBorder { fg = TelescopeNormal.bg.li(20) },
    TelescopeTitle { fg = TelescopeNormal.bg, bg = TelescopeNormal.fg },
  }
end)

-- then pass the extended spec to lush for application
lush(spec)

Could you give an example on how to change colors? Thanks!