This commit also addresses the issues #4 and #5

Adjusting numbering to new chapters tree

# Conflicts:
#   mkdocs.yml

Separate Adiabatic and WKB approximations

See merge request !8

Add mybinder.org configuration

See merge request !6

Updating notes, figures, code

See merge request !5

Template upgrade

See merge request !4

Update tunneling section & adiabatic part

See merge request applications-of-quantum-mechanics/lectures!3