Implement Exercise 4 Chapter 8

See merge request !5

# Conflicts:
#   README.md
#   functional_tests/tests.py
#   lists/static/home1.scss
#   lists/templates/homepage.html
#   lists/templates/list.html
#   superlists/settings.py

Exercise 4

See merge request !4

Exercise 3

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Exercise 2 [EDIT EXTERNAL DB & FORGOT SQUASH COMMIT]

See merge request !2

Exercise 2

See merge request !1