bulma: use Font-Awesome instead of Fontello + start of major redesign: - Font-Awesome is now used instead of Fontello, following change in Libervia Media. - This is a beginning of a major redesign of the web templates/web frontend. This currently breaks a lot of thing.

<div class="has-text-centered my-3">
    <hr class="has-background-info is-marginless">
    <span class="has-text-info is-size-7">{% trans %}new messages{% endtrans %}</span>
    <hr class="has-background-info is-marginless">
</div>