The usefulness of the rerun_demo package is decreasing and not really worth the cost of maintaining. In particular, it includes a demo RRD files which weighs on the wheels and on our CI, and bear little usefulness (the same file is available online and it's hard to install rerun w/o a connection anyways). For these reason, rerun_demo should be removed.

This task involves at least:

• move the utility functions that it contains to a new rerun.utilities sub-package
• update the documentation (at least getting-started/python.md, viewer-walkthrough.md, logging-python.md)
  • viewer-walkthrough.md benefits from having easy access to structure-from-motion example, it should point at the integrated example list for that instead
• update the quick start guides
• update the examples (at least dna uses some of the utilities)
• update the .ipynb
• remove the tests (test_rerun_demo.py)
• update the CI
• remove the relevant config section .mypy.ini
• remove the rerun_demo-specific config in pyrightconfig.json
• update the doc generation script (gen_common_index)
• update pyproject.toml