Add trademark info to the footer

Fixes #45.

snikket_web/scss/app.scss

@@ -138,22 +138,20 @@ body > footer {
 	background-color: $gray-100;
 	color: $gray-800;
 	padding: 0 $w-l1;
+	font-size: 92.21079115%;
 
 	ul {
 		display: block;
 		padding: 0;
 		margin: 0;
 		list-style-type: none;
+		text-align: center;
+		line-height: 1.6267076567643135;
 	}
 
 	li {
-		display: inline-block;
-		margin: $w-l1 0;
-	}
-
-	li:before {
-		content: '•';
-		padding-right: $w-s2;
+		display: block;
+		margin: $w-s1 0;
 	}
 
 	a, a:visited, a:hover, a:active, a:focus {

snikket_web/templates/_footer.html

@@ -3,5 +3,7 @@
 		{#- -#}
 		<li>{% trans about_url=url_for('main.about') %}A <a href="{{ about_url }}">Snikket</a> service{% endtrans %}</li>
 		{#- -#}
+		<li>{% trans %}“Snikket” and the parrot logo are trademarks of Snikket Community Interest Company.{% endtrans %}</li>
+		{#- -#}
 	</ul>
 </footer>