Have `mix usage_rules.search_docs` support docs not stored on hex

[petejodo]

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Is your feature request related to a problem? Please describe.

Coding harnesses will sometimes try to use mix usage_rules.search_docs for Oban Pro which the docs for it are served by https://oban.pro/docs/pro/. It seems like searching docs can only be done against hex and therefore returns 404 for the following mix usage_rules.search_docs "rate_limit partition" -p oban_pro.

Describe the solution you'd like

Ability to query other hex doc servers if possible.

Describe alternatives you've considered

No response

Additional context

No response

[sorentwo]

@petejodo On the Oban Pro side we'd love to support searching with -p oban_pro. The biggest challenge is adding a compliant search endpoint that mirrors the Hexdocs typesense server functionality.

[zachdaniel]

@sorentwo perhaps what we can do in the short term is detect oban_pro and give custom guidance in the output. i.e

# Oban Pro

Documentation for Oban Pro lives at ....