Fix mkdocsstrings config

[llucax]

• Updated the deprecated import config key to inventories
• Fix wrongly located paths key in mkdocs.yml

[Copilot]

Pull Request Overview

This PR updates the mkdocstrings configuration in generated and template docs by renaming the deprecated import key to inventories and relocating the paths setting to the correct indentation under the python handler.

• Rename import: to inventories: in all mkdocs.yml files
• Move paths: out of the options: block directly under the python: handler
• Add a migration helper in cookiecutter/migrate.py and update release notes

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests_golden/integration/.../model/frequenz-model-test/mkdocs.yml	Rename import → inventories and adjust paths location
tests_golden/integration/.../lib/frequenz-test-python/mkdocs.yml	Rename import → inventories and adjust paths location
tests_golden/integration/.../app/frequenz-app-test/mkdocs.yml	Rename import → inventories and adjust paths location
tests_golden/integration/.../api/frequenz-api-test/mkdocs.yml	Rename import → inventories and adjust paths location
tests_golden/integration/.../actor/frequenz-actor-test/mkdocs.yml	Rename import → inventories and adjust paths location
mkdocs.yml	Rename import → inventories and adjust paths location
cookiecutter/{{cookiecutter.github_repo_name}}/mkdocs.yml	Rename import → inventories and adjust templated paths
cookiecutter/migrate.py	Add migrate_mkdocs_yaml to move paths and rename keys
RELEASE_NOTES.md	Document import→inventories change and fix relocation note

Comments suppressed due to low confidence (2)

cookiecutter/migrate.py:53

• The docstring claims it removes the old options: line, but the code only removes the paths: line. Update the docstring (or code) to accurately reflect the actual behavior.

rewrite the file in place to move `paths` directly under `python:` and remove the old `options:` and its `paths:` line.

cookiecutter/migrate.py:71

• [nitpick] This logic relies on hardcoded spaces for indentation, which is brittle. Consider parsing YAML or deriving indentation levels dynamically for more robust migrations.

if line.startswith("        python:"):