Back up invidious data

Invidious is an open source, privacy respecting frontend for youtube. Youtube fights it and and so it breaks occasionally, and the instances are mostly run by enthusiasts, so you can't rely on them to keep your subscriptions and view history forever. I back up my data by creating accounts on invidious instance I use and by exporting the subscription data as JSON. Then I process the JSON with the snipped below which is optional, but it reduces the commit noise.

jq --sort-keys '.subscriptions = (.subscriptions | sort)' subscription_manager.json > backup.json