nvim: init: Use zathura as PDF viewer

nvim/.config/nvim/init.lua

@@ -79,9 +79,8 @@ vim.g.maplocalleader = ","
 vim.g.quickr_cscope_keymaps   = 0
 -- Needs to be set before vimtex gets loaded, else it complains
 vim.g.tex_flavor = 'latex'
-vim.g.vimtex_view_general_viewer = 'qpdfview'
+vim.g.vimtex_view_general_viewer = 'zathura'
 vim.g.vimtex_view_general_options = '--unique \\@pdf\\#src:@tex:@line:@col'
-vim.g.vimtex_view_general_options_latexmk = '--unique'
 -- Needs to be before togglelist gets loadded
 vim.g.toggle_list_no_mappings = 1
 -- Enable rainbow brackets everywhere