Share profile picture in Mooncake

[Seraphiana]

It would be really good if mooncake would show objective8 user's profile pictures

This would replace the coloured circles in the feed, likely by providing a link to the relevant user info endpoint from the SSO provider for each of the activities.

Mooncake could then query this endpoint for the particular user and use it in its feed.

storing these images locally temporarily would be something worth looking into, to reduce the amount of necessary queries to render the feed.