use symlink invocation for zathura firejail

Existing users will need to remove the old script first.

    # rm /usr/local/bin/zathura

roles/office/files/zathura.sh

@@ -1,11 +0,0 @@
-#!/bin/sh
-
-FIREJAIL=""
-
-hash firejail 2> /dev/null
-
-if [ $? -eq 0 ]; then
-    FIREJAIL=firejail
-fi
-
-$FIREJAIL /usr/bin/zathura \"$@\"

roles/office/tasks/main.yml

@@ -23,7 +23,9 @@
     - zathura-ps
 
 - name: Jail Zathura
-  copy: src=zathura.sh dest=/usr/local/bin/zathura mode=0755
+  file: src=/usr/bin/firejail
+        dest=/usr/local/bin/zathura
+        state=link
   tags:
     - firejail