[docs] Document which online sync-ups are no longer happening

[kbeyls]

Some of the online sync-ups on our Getting Involved page seem to no longer be happening. Document them as no longer happening, so that people don't get confused when dialing in to one of these.

[sdesmalen-arm]

These changes look fine to me. I can indeed confirm the Scalable Vectors & Arm SVE sync-ups are indeed no longer happening.

Just to be sure, did you build the HTML page to confirm that the table is rendered as expected?

[kbeyls]

These changes look fine to me. I can indeed confirm the Scalable Vectors & Arm SVE sync-ups are indeed no longer happening.

Just to be sure, did you build the HTML page to confirm that the table is rendered as expected?

Abolutely. The rendered result looks as follows:

[simoll]

The vector predication syncup is no longer happening

[appujee]

Thanks for updating the list. Should we have a criteria that if any meetings haven't had N occurrences then they can be safely deleted?

[kbeyls]

Thanks for updating the list. Should we have a criteria that if any meetings haven't had N occurrences then they can be safely deleted?

I'm not sure what a good rule of thumb would be.
Maybe for now, let's land this PR and get the framework set up to indicate which online sync-ups are no longer happening. We can refine guidelines on when to move online sync-ups from "active" to "past" as we gain more experience.

[Playgirlkaybraz11]

llvm/docs/GettingInvolved.rst

[Playgirlkaybraz11]

@sdesmalen-arm @ #89208 #80309 #107735 #89208 #99278