🗑️ remove(nvim): headlines plugin declaration in markdown extra

.config/nvim/lua/plugins/extras/lang/markdown-extended.lua

@@ -1,14 +1,5 @@
 return {
   { import = "lazyvim.plugins.extras.lang.markdown" },
-  {
-    "lukas-reineke/headlines.nvim",
-    opts = {
-      markdown = {
-        headline_highlights = false,
-      },
-    },
-    ft = { "markdown", "norg", "rmd", "org" },
-  },
   {
     "gaoDean/autolist.nvim",
     ft = {