Add proper following function

[veryrealwildcat]

It would be great for ProxiTok to have a proper following function similar to Piped and Invidious for Youtube rather than the rss feed, to let us finally delete the mobile app. Having the rss feed is great, however it doesn't work well for ProxiTok since it becomes very difficult to organise and use, and generally makes it harder to switch over from using the app.

Piped and Invidious handle this through an account system, maybe ProxiTok could take the same approach or use cookies to store followed accounts, and even liked and/or favorite videos down the road.