[release] 1.13.0-beta01

Raccoons of the Lemmyverse, we're back! A new beta version of the app has been released, as promised in the last AMA (it was the next internal milestone).

Let us know what you think about it, you'll notice that there have been several layout improvements since the last version, e.g. bottom sheets have a new style, clickable areas now show the ripple effect, etc.

Hope you all enjoy it and, as always, L.F.E.T. 🦝🦝🦝