Proceed with the Django Girls tutorial

[webknjaz]

Do a PR per each tutorial page or less, trying to identify atomic sets of changes or an easily reviewable size. For simplicity of tracking the progress, you may add a checkboxed markdown list here. Do your best to apply what you learned in the previous tasks.

https://tutorial.djangogirls.org/en/

The main objective here is not to blindly follow the tutorial (it has a lot of oversimplifications and the practices describe don't follow the real-world professional development standards) but to do better and practice development according to our GitHub Flow flavor in the environment of linters, tests and code reviews. We'll also do more integrations with other systems along the way.

[OlenaYefymenko]

During the tutorial, the following should be implemented:

• [x] 🚀 Create the Django project (init, change settings, set up a database, pip-tools);
• [x] 🎯 Integrate cognitive complexity checkers into a project;
• [x] 🏃‍♀️ Add coverage and tests in CI runner;
• [x] 🪂 Integrate the Codecov tool in the CI runner;
• [x] 🎆 Create models for app (migrations, tests);
• [x] 🧩 Integrate views, urls (post_list) for the app and tests;
• [x] 🌞 Integrate views, urls (post_detail) for the app and tests;
• [x] ☂️ Extend coverage measurement tool for the project (changes in the configuration)
• [ ] ❤️ Integrate forms.py, views, urls (post_new, post_edit) for the app and tests of course :);