Prevent and fix Django technical debt

Django Doctor suggests fixes for over 40 types of Django tech debt found in your pull requests to help you write high-quality code, release faster, and save time.

template.htmlmaintainabilitymedium
-
<img src="/static/logo.png" />
+
{% load static %}
+
<img src="{% static 'logo.png' %}" />

Hard-coding static asset urls is brittle because the place the files are stored depends on the `STATICFILES_STORAGE` used - so if in prod the storage backend uploads to S3 or even renames the file then this hard-coded URL will break.

Using "{% static ... %}" solves that as it knows exactly where the files are stored.

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models.py
# Challenge 1/8: This models.py can be improved a bit. Can you fix the issues?

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