Use zathura with vimtex

lua/autocommands.lua

@@ -45,6 +45,7 @@ vim.api.nvim_create_autocmd("FileType", {
   callback = function()
     -- vimtex configuration
     vim.g.vimtex_view_method = 'zathura'
+    vim.g.vimtex_view_general_viewer = 'zathura'
     vim.g.maplocalleader = ' '
     -- Legacy shortcut from my vim-latexsuite days
     vim.api.nvim_set_keymap("n", "<Leader>ls", ":VimtexView<CR>",