Use user_id in places we were using username. Still debating this.
Start getting this working with API backend, until there were calls to
/api/sticker which don't exist in the API yet. Then I rediscovered the
local json-server.
So now there are 2 api backends. We'll incrementally migrate from the
first version to the second.
SCSS and tailwind weren't working for nav-items.css. The browser just
saw the raw version. So for now, just inlined that. Probably these
nav items will become components (if they are shared).
Move everything to StickersStore.
Reason is because after setting the sticker owner, it was updating the sticker in the sticker store, but it should update the store that has all the stickers. Profile page will lookup stickers in the stickers store.
