fix(external docs): render all top level configuration fields

[pront]

Summary

• Removes hacky global_option(...) workaround (logic moved in a single place, scripts/generate-component-docs.rb)
• Introduces config pages for other top level config fields that were previously undocumented
• Removes special handling of docs exclusions, now we can use #[configurable(metadata(docs::hidden))] like in other components
• Adds docs for schema options
• Better navigation: Sidebar now expands when clicking on "Configuration" to show all sub-pages

Vector configuration

How did you test this PR?

Change Type

• Bug fix
• New feature
• Dependencies
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

Related: #21735

Notes

• Please read our Vector contributor resources.
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  • Alternatively, we recommend running the following locally before pushing to the remote branch:
    • make fmt
    • make check-clippy (if there are failures it's possible some of them can be fixed with make clippy-fix)
    • make test
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• If this PR introduces changes Vector dependencies (modifies Cargo.lock), please
  run make build-licenses to regenerate the license inventory and commit the changes (if any). More details here.

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[thomasqueirozb]

Nice improvements!

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