Make terms page smarter about the agreement

People are emailing us asking if their organisation has signed the
agreement. In some cases they have, so this is a waste of their and
our time.

This commit adds a bit of logic to the terms of use page to tell users
when their organisation has already signed the agreement.

app/main/views/index.py

@@ -9,6 +9,7 @@ from app import convert_to_boolean
 from app.main import main
 from app.main.forms import SearchTemplatesForm
 from app.main.views.sub_navigation_dictionaries import features_nav
+from app.utils import GovernmentDomain
 
 
 @main.route('/')
@@ -152,7 +153,8 @@ def security():
 def terms():
     return render_template(
         'views/terms-of-use.html',
-        navigation_links=features_nav()
+        navigation_links=features_nav(),
+        agreement_info=GovernmentDomain.from_current_user(),
     )