[nvim] gitsigns setup fix and configuration

config/nvim/lua/plugins/gitsigns.lua

@@ -1,3 +1,11 @@
 return {
 	"lewis6991/gitsigns.nvim",
+	lazy = true,
+	event = { "BufReadPre", "BufNewFile" },
+	opts = {
+		signs = {
+			add = { text = "+" },
+			delete = { text = "-" },
+		},
+	},
 }

config/nvim/lua/plugins/null-ls.lua

@@ -2,6 +2,7 @@ return {
 	"jose-elias-alvarez/null-ls.nvim",
 	dependencies = {
 		"nvim-lua/plenary.nvim",
+		"lewis6991/gitsigns.nvim",
 	},
 	config = function()
 		local null_ls = require("null-ls")