Update the weekly meeting documentaton

[jenlampton]

Since Hangouts & Gitter are dead, we need to update https://github.com/backdrop/backdrop-issues/wiki/Weekly-Meeting:-Run

[ghost]

Updated link above.

[kiamlaluno]

Is this a task for specific users? I noted I can edit the Wiki page, but I am not sure I should edit it.

[ghost]

@kiamlaluno If you'd like to help out and edit it, feel free (that's the point of a wiki). But in this case I think someone with knowledge of how to run the meeting needs to do it. And I believe that's going to be one of @quicksketch, @jenlampton or @stpaultim...

[kiamlaluno]

I apologize: I thought the task was removing the references to Hangouts and Gitter. (I guess I gave to update a too limit meaning. 😅)