docs: [FC-0074] add more detailed concepts on events

[mariajgrimaldi]

Description

This PR improves the concept section of the documentation by adding a new document dedicated only to Open edX Events.

Initially, I also added two additional modifications:

1. Update references in the Hooks Extension Framework document and explain why the framework should be adopted.
2. Adding a new document comparing Open edX Events vs Filters to ease adoption.

Which I later dropped in favor of centralizing shared documentation docs.openedx.org and avoiding duplication across repos: So I'll be moving those docs to docs.openedx.org, Here's the PR for the implementation: openedx/docs.openedx.org#599

For more details on the decision, please see this thread.

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Thanks for the pull request, @mariajgrimaldi!

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[mariajgrimaldi]

@sarina @Apgomeznext: here's the WIP I've been working on for the 1.1 Improve Definitions and Update Outdated References in the Framework project feature.

I discussed with AnaP having feedback loops within the maintenance team about the documents' content. She'd get involved to review the document structure once she has the capacity for the project. So, early feedback is welcome.

[sarina]

Maybe have "Event Bus" link to documentation on the event bus?

[mariajgrimaldi]

Done: 6926b20#diff-982f9d143e6afcea5b84eeb1ea3c3fb5412239c1968359fab161cb4af58e9b63R62

But the only available docs we have to date about the event bus is a confluence document, so that's what I linked: https://openedx.atlassian.net/wiki/spaces/AC/pages/3508699151/How+to+start+using+the+Event+Bus. Once we move those documents here, I'll update the references.

[sarina]

I think it would be good to include some detail about how you don't need to modify code within the openedx github org to achieve this. Could we link out to some third-party examples?

[mariajgrimaldi]

Absolutely! I'm currently working on a list of use cases. In the next few hours, I'll link the PR here in this comment.

I'll link the PR here in this comment tomorrow.

[sarina]

Overall it Looks great now, I'll do a final review once these use cases are in

[mariajgrimaldi]

I haven't had the time to work on this. So I'll be on it today. Thank you for the patience!

[mariajgrimaldi]

Here's the PR with the use cases: #416

[mariajgrimaldi]

I'll merge this once the CLA check passes. I'm not sure why it's taking so long.