Uploads a profile picture from base64 data, saves it to user’s home directory, and updates the user’s profile
JWT token passed in x-access-token header
Base64 encoded image data with data URI prefix
"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg=="