add indent_line and simplify uv

lua/plugins/indent_line.lua

@@ -0,0 +1,14 @@
+return {
+  { -- Add indentation guides even on blank lines
+    'lukas-reineke/indent-blankline.nvim',
+    main = 'ibl',
+    config = function()
+      -- passing as an option does not work correctly at present w/ toggle
+      require('ibl').setup {}
+      require('ibl').update { enabled = false }
+    end,
+    keys = {
+      { '<Leader>ib', '<cmd>IBLToggle<cr>', desc = 'Indent lines toggle' },
+    },
+  },
+}