Docs: replace all `datetime` imports with `import datetime as dt` (GH-145640)
(cherry picked from commit 83360b5869a4981c87dcb59d1186d26c41fe3386)
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Remove diff.py and ndiff.py scripts of Tools/scripts/: move them to
Doc/includes/.
* diff.py and ndiff.py files are no longer executable. Remove also
their shebang ("#!/usr/bin/env python3").
* Remove the -profile command from ndiff.py to simply the code.
* Remove ndiff.py copyright and history command. The Python
documentation examples are distributed under the "Zero Clause BSD
License".