Treewide: update some problematic homepages

These URLs are reported as problematic by Repology.
It could be a permanent redirection
or the page does not exist anymore

pkgs/development/python-modules/django_evolution/default.nix

@@ -19,7 +19,7 @@ buildPythonPackage rec {
 
   meta = with stdenv.lib; {
     description = "A database schema evolution tool for the Django web framework";
-    homepage = http://code.google.com/p/django-evolution/;
+    homepage = "https://github.com/beanbaginc/django-evolution";
     license = licenses.bsd0;
     broken = true;
   };