remove copilot and added some modifs

lua/custom/plugins/render-markdown.lua

@@ -0,0 +1,9 @@
+return {
+  'MeanderingProgrammer/render-markdown.nvim',
+  dependencies = { 'nvim-treesitter/nvim-treesitter', 'echasnovski/mini.nvim' },   -- if you use the mini.nvim suite
+  -- dependencies = { 'nvim-treesitter/nvim-treesitter', 'echasnovski/mini.icons' }, -- if you use standalone mini plugins
+  -- dependencies = { 'nvim-treesitter/nvim-treesitter', 'nvim-tree/nvim-web-devicons' }, -- if you prefer nvim-web-devicons
+  ---@module 'render-markdown'
+  ---@type render.md.UserConfig
+  opts = {},
+}

lua/custom/plugins/vimtex.lua

@@ -3,6 +3,8 @@ return {
   lazy = false, -- we don't want to lazy load VimTeX
   init = function()
     -- VimTeX configuration goes here, e.g.
-    vim.g.vimtex_view_method = 'zathura'
+    vim.g.vimtex_view_general_viewer = 'okular'
+    vim.g.vimtex_view_general_options = '--unique file:@pdf#src:@line@tex'
+    vim.g.tex_flavor = 'latex'
   end,
 }