Fix simple example notebooks: disable background map, robust LV grid …

[nader-00]

Description

plot_mv_grid_topology() defaults to background_map=True, which fetches map tiles via contextily and can hang for tens of minutes or fail without a good internet connection. Disabled in the example notebooks with a note on how to re-enable it.

Also replaced a hardcoded LV grid ("LVGrid_170173" / index 5), which has no loads with some grid data (e.g. ding0_test_network_1), with a selection that picks the LV grid with the most loads.

Fixes #276

Supersedes the abandoned, unmergeable PR #292.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• New and adjusted code is formatted using the pre-commit hooks
• New and adjusted code includes type hinting now
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• The Read the Docs documentation is compiling correctly
• If new packages are needed, I added them the setup.py, and if needed the rtd_requirements.txt, the eDisGo_env.yml and the eDisGo_env_dev.yml.
• I have added new features to the corresponding whatsnew file