feat(nvim): add zen mode and twilight

modules/programs/nvim/plugins/twilight-nvim.lua

@@ -0,0 +1,3 @@
+require("twilight").setup({
+  context = 20,
+})

modules/programs/nvim/plugins/zen-mode-nvim.lua

@@ -0,0 +1,4 @@
+require("zen-mode").setup()
+require("which-key").register({
+  z = { "<cmd>ZenMode<cr>", "Zen mode" },
+}, { prefix = "<leader>t" })