feat(nvim): add diffs.nvim and update plugin packages

Author: ruicsh

lua/plugins/diffs.lua

@@ -0,0 +1,14 @@
+-- Git diffs syntax highlighting
+-- https://github.com/barrettruth/diffs.nvim
+
+return {
+	"barrettruth/diffs.nvim",
+	init = function()
+		vim.g.diffs = {
+			integrations = {
+				fugitive = true,
+				gitsigns = true,
+			},
+		}
+	end,
+}