counter: don't display info boxes and navigation menu

This will lighten the pages and make the functionality directly
accessible without ever scrolling the header garbage that is never
needed on those pages.

com/tests.py

@@ -79,9 +79,11 @@ class ComTest(TestCase):
         )
         r = self.client.get(reverse("core:index"))
         self.assertTrue(r.status_code == 200)
-        self.assertTrue(
-            """<div id="alert_box">\\n                <div class="markdown"><h3>ALERTE!</h3>\\n<p><strong>Caaaataaaapuuuulte!!!!</strong></p>"""
-            in str(r.content)
+        self.assertContains(
+            r,
+            """<div id="alert_box">
+                    <div class="markdown"><h3>ALERTE!</h3>
+<p><strong>Caaaataaaapuuuulte!!!!</strong></p>""",
         )
 
     def test_info_msg(self):
@@ -95,9 +97,10 @@ class ComTest(TestCase):
         )
         r = self.client.get(reverse("core:index"))
         self.assertTrue(r.status_code == 200)
-        self.assertTrue(
-            """<div id="info_box">\\n                <div class="markdown"><h3>INFO: <strong>Caaaataaaapuuuulte!!!!</strong></h3>"""
-            in str(r.content)
+        self.assertContains(
+            r,
+            """<div id="info_box">
+                    <div class="markdown"><h3>INFO: <strong>Caaaataaaapuuuulte!!!!</strong></h3>""",
         )
 
     def test_birthday_non_subscribed_user(self):