fix(zathura): added ocr for easier ctrl+f

zathura had an issue where pdf's cannot be read via `find word` due to
the process being unable to read `image text`. a solution is to convert
it to ocr.

apps/zathura/default.nix

@@ -1,5 +1,12 @@
-{ pkgs, config, lib, ... }:
 {
+  pkgs,
+  config,
+  lib,
+  ...
+}: {
+  home.packages = with pkgs; [
+    ocrmypdf
+  ];
   programs.zathura = {
     enable = true;
     options = {