Issue: Python Repo needs some cleanup

[jeseekia]

• [x] Organize workshops and demo class
• [x] Update Python 1 theme
• [x] Update Python 2 theme
• [x] Add pre/post slides to Python 1
• [x] Add pre/post slides to Python 2

[jeseekia]

This issue is to track some preliminary cleanup including fixing broken links, organizing shared files and retheming outdated slides.

[jeseekia]

https://github.com/girldevelopit/gdi-python/pull/2