expired HTTPS certificate

I know it has already been switched to read-only, but I think running the archive a bit longer will help the transition.

We’re in the process of replacing the askbot instances with static sites rebuilt from the database dumps created during the migration to Robotics StackExchange. The questions which successfully migrated will redirect to their new location there and the remaining ones will be displayed on static pages.

In the meantime the https cert has been updated again.