nvim-config/after/plugin/gitsigns.lua

local installed, gitsigns = pcall(require, "gitsigns")
if installed then
  gitsigns.setup({
    signs = {
      add = { text = "+" },
      change = { text = "~" },
      delete = { text = "_" },
      topdelete = { text = "‾" },
      changedelete = { text = "~" },
    },
  })
end