set git to rebase on pull

hosts/common/common.nix

@@ -55,6 +55,8 @@
     vim
     fritzing
     networkmanagerapplet
+    grim
+    slurp
   ];
 
 }

hosts/common/home.nix

@@ -71,6 +71,7 @@
       core.editor = "vim";
       core.autocrlf = "input";
       credential.helper = "store";
+      pull.rebase = "true";
     };
   };