[Standup Updates] Avatars

[GALTdea]

Description
Small user avatars should float somewhere visible on the Projects#index screen and on each day’s standup screen. My one idea for a visual design here would be to have a horizontal row of avatars below the project name, or somewhere prominent like that, with a width of ~50px or something like that.

Users that have completed a standup for that day are visually differentiated from users that have not. (Design ideas: lightly gray user avatars that are missing standups for the day, different color borders for those that have / haven’t completed their updates, overlayed checkmarks, etc.)

This issue requires wireframe and design doc
Wireframe
Design Doc