remove copilot and added some modifs

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,
 }