Discard username display

[pcaversaccio]

Instead of displaying the username (which are allowed to become 20 chars long) we should not show the username at all:

We can work in a similar way GitHub does it:

[locpnh0409]

To make this correctly, we need backend support user info.
We will build an Profile page for user, allow user change Avatar, Display name, Change password etc.,

[pcaversaccio]

Target date of this issue is mid/end of October