updated functions.py to pass zipping trailheads if it tries and there are none
nothing but whitespace removal
new route for skipping trailhead upload, heading to new 'no-trailheads.html' view
added button to skip trailhead upload
created new view for no-trailhead download
added classes for new placement of more subtle success message
removed the 'three files' language at top of step tracker, updated step tracker margins
updated alert style and placement, and 'skip trailheads' button
removed the 'three files' language at top on two more pages
one last success alert restyling
resolving merge in routes.py