Document accept_http and update HTTP operators

[mavam]

Summary

• Add documentation for the new accept_http operator (HTTP server that accepts incoming requests as events)
• Update from_http documentation to reflect the new client-only design with $response pipeline variable (replacing metadata_field and server=true mode)
• Add accept_http cross-reference to the http operator's See Also section

Related PRs

• HTTP operators with Proxygen support tenzir#5776

Test plan

• Verify accept_http.mdx renders correctly with all sections
• Verify from_http.mdx no longer references server=true mode
• Verify cross-references resolve between accept_http, from_http, and http

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