Maybe as a followup to #192 we could try to update the bastion arch picture.

It would allow us to put it back on the readme and it would look better on the website :)

I'm confused about the example for data migration during code updates. The runMigration example function asserts that this is an upgrade from version 0 to version 1. Shouldn't this be from version 1 to version 2? Or am I completely misunderstanding how migrations work?