Remove beta badge from header

We have found repeatedly in research that our users don’t know what
‘beta’ means. In this situation they come up with their own
interpretation of what it means, for example that:
- certain features are not available to them
- Notify as a whole is not available to them
- they are using a ‘different’ version of Notify to those using it for
  real

In the most severe cases this ambiguity actively dissuades users from
adopting Notify. We know this from support tickets and user research;
there are probably a host of other teams we haven’t spoken to.

Here’s a quote from a user research session just last week:

> Once we’ve got the facility to receive inbound messages […] that’s not
> available to us at the moment with a beta account

From support tickets:

> We see that the service is still in beta mode – can we assume
> uninterrupted service reliability and performance?

> we do not have a .gov.uk email address any longer but I was wondering
> if we would be able to utilize the notify system which is currently in
> beta

> We are currently using the BETA version, are we able to switch to the
> TEST version so we can add other numbers to send SMS to?

> I have previously enquired about this option [receiving text messages],
> but thought it was still at Beta stage. If we can set it up so that
> notify handles the responses that would be great.

> [after going live] Should I see the wording LIVE on the login screen
> as I still see BETA.,....

> Also I note that you are a BETA service just now and that to use the
> service we would need a .gov.uk email address. We don't have this, is
> there any way that [redacted] could use the service as I note that one
> of the teams have an account?

---

This commit removes the beta badge from Notify, and hopefully with it
the confusion it’s causing our users.

app/templates/admin_template.html

@@ -33,9 +33,6 @@
   </p>
 {% endblock %}
 
-{% block inside_header %}
-  <strong class='beta-badge'>Beta</strong>
-{% endblock %}
 {% block header_class %}with-proposition{% endblock %}
 {% block proposition_header %}
   <div class="header-proposition">