chore: use lighter color for borders

lua/plugins/colorscheme.lua

@@ -1,4 +1,18 @@
 return {
+    {
+        "dineshsalunke/poimandres.nvim",
+        priority = 1000,
+        config = function()
+            require("poimandres").setup({
+                disable_background = true,
+                disable_float_background = true,
+                groups = {
+                    border = "blueGray1",
+                },
+            })
+            vim.cmd.colorscheme("poimandres")
+        end,
+    },
 
     {
         "catppuccin/nvim",