[web] render user avatar in account screen

Summary:
rendered user avatars in the account screen

This diff won't be landed until avatars is given the green light to be released

Depends on D7274

Test Plan:
Please see the screenshot below to see the changes I made:

Reviewers: ashoat, atul

Reviewed By: atul

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7194