Remove duplicate date_within template tag

conservancy/podjango/templatetags/date_within.py

@@ -1,11 +0,0 @@
-from datetime import datetime, timedelta
-
-from django import template
-
-register = template.Library()
-
-
-@register.filter
-def date_within_past_days(value, arg):
-    # question: does datetime.now() do a syscall each time is it called?
-    return value > (datetime.now() - timedelta(days=int(arg)))