Moonstream Analytics frontend should encode currently open subscription in URL

[zomglings]

Currently, the URL route remains https://moonstream.to/portal/analytics regardless of which subscription is currently open:

I would like the URL to have a query parameter like:

https://moonstream.to/portal/analytics?subscription_id=<id>

That way users can save links to specific subscriptions. We could even add query parameters that highlight a query in the subscription view.

This will already be useful for users who want to store links a shortcuts to specific operations. It will be even more useful when we add sharing functionality into the application.