[DOCS][API] Add TheHive connector config and secrets

[lcawl]

Summary

Relates to #180138

This PR adds TheHive connector config and secrets for the create/update connector API and the associated createAlert and pushToService details for the run connector API.
This information will be published in https://www.elastic.co/docs/api/doc/kibana and https://www.elastic.co/docs/api/doc/serverless

It also removes some bedrock doc files that are no longer required and adds a reminder in the connector doc template to update the API files as well.

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[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[brijesh-elastic]

LGTM.

[doakalexi]

LGTM!

[kilfoyle]

LGTM! 🐉

[kibana-ci]

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• 💛 Build #233136 was flaky e583377

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