Merge branch 'fix/header-home' into 'master'

Fix header on homepage if slider is not used

See merge request !1120

website/thaliawebsite/static/css/base.scss

@@ -154,7 +154,7 @@ body {
         padding-bottom: 21.5%;
         position: relative;
 
-        #announcements-slider {
+        .image, #announcements-slider {
             position: absolute;
             top: 0;
             bottom: 0;