A quick and dirty dev portal for the rebble app store

The rebble app store now accepts new apps, thanks to the hard work of @Joshua and co, and he describes the process required to submit an app here. Currently though, it’s a bit of a manual process. To fix that, I’ve put together a dev portal of sorts, in which you upload your screenshots, pbw, and more, and the SPA will auto generate the yaml and wrap everything up nicely in a .zip file, which you can then send to @Joshua on the rebble discord to get your app on the store.