Add user profile picture edit to account page

[haypho]

Description

When I am viewing the account page, there is currently an avatar with a blank user to represent my profile. I should be able to add a new image so that others can view it.

Acceptance Criteria

• Given I am a user when I am viewing my avatar at the top of the account screen then I should be able to press it to upload a new image
• Given I am a user when I am editing my avatar image on the account page then I should be able to remove the avatar completely in order to default to the blank user