Don't define __ne__ methods, they're implicit since Py3 (#2735)

mkdocs/structure/files.py

@@ -138,9 +138,6 @@ class File:
             self.url == other.url
         )
 
-    def __ne__(self, other):
-        return not self.__eq__(other)
-
     def __repr__(self):
         return (
             f"File(src_path='{self.src_path}', dest_path='{self.dest_path}',"

mkdocs/structure/pages.py

@@ -49,9 +49,6 @@ class Page:
             self.file == other.file
         )
 
-    def __ne__(self, other):
-        return not self.__eq__(other)
-
     def __repr__(self):
         title = f"'{self.title}'" if (self.title is not None) else '[blank]'
         url = self.abs_url or self.file.url