Promote BuildStream 2.0

This is a non-development task, we might want to track it in a different manner but .. let's start with a Github issue.

Now that Bst 2.0 is ready for release, we should consider how to promote its use.

## Talks

* OSSEU 2022 - [done](https://osseu2022.sched.com/event/19vvz/sponsored-session-integrating-software-stacks-with-buildstream-20-and-the-remote-execution-api-sam-thusfield-codethink), [video](https://www.youtube.com/watch?v=Mvi6pylo-8o)
* ApacheCon 2022 - [done](https://www.apachecon.com/acna2022/schedule.html), [writeup](https://blogs.gnome.org/tvb/2022/10/14/buildstream-at-apachecon-2022-new-orleans/)
* FOSDEM 2023 - ?
* other ideas... ?

## Articles

* LWN - ?
* Opensource.com - ?
* Codethink blog - ?
* other ideas ... ?

## Merchandise

* Stickers (to be handed out at conferences, etc.)
* T-shirts ? (these are logistically tricky due to size)

## Videos

* Convert some of the BuildStream 2.0 examples as screencasts on YouTube

Review the Talks, Articles, Merchandise, and Videos sections, including the existing event links and completed items. Decide which promotional activity has a concrete owner and deliverable; the issue does not yet define a specific scope or completion criterion.

Written by the indexing model from the issue text.