🧹 Organize project root directory

- Move documentation files to docs/summaries/
- Move temporary files to temp/ directory
- Keep only essential files in root directory
- Improve project structure and maintainability

temp/.pytest_cache/README.md

@@ -0,0 +1,8 @@
+# pytest cache directory #
+
+This directory contains data from the pytest's cache plugin,
+which provides the `--lf` and `--ff` options, as well as the `cache` fixture.
+
+**Do not** commit this to version control.
+
+See [the docs](https://docs.pytest.org/en/stable/how-to/cache.html) for more information.