update outline with links to plain html for week 3 and 4
fixing up the assignment folder and presentation for session 04
set up assignment for week 5
re-organized session 5 to build the basic flask app.  login and flash messaging saved for homework
add image of flask helloworld app in browser for session 5 slides
break three portions of the former session 5 lecture out into tutorials to be walked through during the week before session 5
basic starting point for the session 5 flask app.
merged in more radical changes to session 5/6 structure