There is no equivalent of _index.yaml overview pages

https://github.com/search?type=code&q=path%3A_index.yaml+repo%3Abazelbuild%2Fbazel - ten such pages per version)

Start with the linked Bazel search results to understand the existing _index.yaml overview pages and compare them with the generated bazel-docs site. Trace the documentation generation entry point and determine how equivalent overview pages should be produced for each version; done means the expected pages are generated consistently.

Written by the indexing model from the issue text.