use slim chars for blankline indent

also enable indent markers in nvimtree

lua/plugins/configs/nvimtree.lua

@@ -36,7 +36,7 @@ local options = {
     highlight_opened_files = "none",
 
     indent_markers = {
-      enable = false,
+      enable = true,
     },
 
     icons = {

lua/plugins/configs/others.lua

@@ -2,8 +2,8 @@ local M = {}
 local utils = require "core.utils"
 
 M.blankline = {
-  indent = { highlight = "IblChar" },
-  scope = { highlight = "IblScopeChar" },
+  indent = { char = "│", highlight = "IblChar" },
+  scope = { char = "│", highlight = "IblScopeChar" },
 }
 
 M.luasnip = function(opts)