docs: [FC-0074] add new hooks docs in concepts section

[mariajgrimaldi]

Description

This PR moves the old hooks guide into its own concepts subsection. It also solves the duplication of documents in openedx-events and filters when referencing shared concepts like the overall hooks framework and comparison between the two to reduce maintenance efforts.

Supporting information

See openedx/openedx-events#406 and openedx/openedx-filters#222 where I started the conversation of moving these documents here.

[openedx-webhooks]

Thanks for the pull request, @mariajgrimaldi!

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[mariajgrimaldi]

Closed in favor of openedx/docs.openedx.org#599