Add license notice, closes #12

Needs adjustment to the pelicanconf.py of every website. Then an optional license meta attribute can be added to pages and articles. LICENSETEXTS = {"de": "Der Inhalt dieser Seite steht unter", "en": "This page is licensed under"}

static/css/style.css

@@ -50,6 +50,10 @@ ul.dropdown-menu > li.active > a {
 	color: #f8f8f8;
 }
 
+.licence {
+	text-align: center;
+}
+
 footer#main-footer {
 	background: var(--teckids-secondary-light);
 	color: #ffffff;