Update Toga and Chaquopy

   Update BeeWare and Chaquopy

   Add pythoncheatsheet.org to the Python-Related Cheat Sheets section.

   Add PyData Helsinki and PyLadies Tampere

   update site

   Add AfroPython Conf

   python 3 support dropped with new version of pyfirebirdsql

   Fixed minor mistake in the example. Updated syntax to work in Python 3. Replaced bad link with a version in the internet archive.

   Change title from Non-Programmers to New Programmers

   nits, spelling