removing glob imports, added script to detect dangling imports

[jasonmadigan]

• Cleanup dangling imports, remove globs
• removing glob imports, added script to detect dangling imports, generates explicit multirepo imports from the nav:
  • Can be run manually: python3 validate_imports.py

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[jasonmadigan]

@david-martin fyi - ready for review. I did keep some of the image globs in the end, but none of the doc ones.

[david-martin]

👀

[david-martin]

/lgtm

This highlights the high number of files that are still being published because they are linked to, but don't have a location in the nav.
Looks to be primarily docs pulled in from the authorino repo, and linked from the '/docs/user-guides/observability.md' file

The changes in the PR are sufficient to satisfy #181.
There is ongoing discussion around authorino content, and that observability file, which may lead to some further cleanup.