Add homepage link to discover

Use it instead of going to Hosted Weblate projects.

Author: nijel

weblate_web/templates/snippets/users.html

@@ -6,5 +6,5 @@
 <a href="https://hosted.weblate.org/engage/freedombox/"><img src="{% static "img/logo-freedombox.svg" %}" alt="Freedombox" /></a>
 <a href="https://hosted.weblate.org/projects/collabora-online/"><img src="{% static "img/logo-collabora.svg" %}" alt="Collabora" /></a>
 <div class="clear"></div>
-<a href="https://hosted.weblate.org/projects/" class="button border small rev inline" target="_blank">{% trans "See all projects" %}</a>
+<a href="{% url 'discover' %}" class="button border small rev inline" target="_blank">{% trans "Discover Weblate" %}</a>
 <a href="{% url 'donate' %}#thanks" class="button border small rev inline">{% trans "See all supporters" %}</a>