vim: Fix vimtex backward search with zathura

semi-hardcoded path is not good, but flexible enough for now

home/.config/nvim/init.vim

@@ -75,6 +75,9 @@ let g:tex_flavor='latex'
 let g:vimtex_view_method='zathura'
 set conceallevel=1
 let g:tex_conceal='abdmg'
+" nvr is (currently) not in debian repos and therefore installed with pip (in
+" local directory that is not in zathura’s PATH)
+let g:vimtex_compiler_progname='$HOME/.local/bin/nvr'
 " this disables some helful warnings that often have a reason why I ignore them
 let g:vimtex_quickfix_ignore_filters = [
   \'Underfull \\hbox (badness [0-9]*) in paragraph at lines',