Add in docs .python-version and CHANGELOG.md files (#2411)

* Add in docs .python-version and CHANGELOG.md files

* Update overview.rst

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

* Mentioned pyenv for the .python-version file

* Fix lint error: D001 Line too long

---------

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

{{cookiecutter.project_name}}/docs/pages/template/overview.rst

@@ -38,6 +38,14 @@ root project
   It basically defines what to do with your project
   after pushing it to the repository. Currently it is used for testing
   and releasing a ``docker`` image
+- ``.python-version`` - file that specifies the Python version
+  to be used for the project, particularly when using `pyenv`.
+  This file helps in maintaining a consistent Python environment
+  across different machines and environments
+- ``CHANGELOG.md`` - file that contains a chronological
+  log of all notable changes made to the project. It provides
+  a comprehensive overview of the project's evolution and
+  helps users and contributors understand the development history
 - ``docker-compose.yml`` - this the file specifies ``docker`` services
   that are needed for development and testing
 - ``docker-compose.override.yml`` - local override for ``docker-compose``.
@@ -93,6 +101,7 @@ docker
 tests
 ~~~~~
 
+- ``tests/plugins`` - ``pytest`` plugins that are used in this project
 - ``tests/test_server`` - tests that ensures that basic ``django``
   stuff is working, should not be removed
 - ``tests/test_apps/test_main`` - example tests for the ``django`` app,