présentation: ajoute le logo de l'UNIGE

Co-Authored-by: iGor milhit <igor@milhit.ch>

dist/theme/unige.css

@@ -43,6 +43,18 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
   background-color: var(--r-background-color);
 }
 
+/*********************************************
+ * LOGO
+ *********************************************/
+
+body::after {
+  position: fixed;
+  left: 2em;
+  bottom: 2em;
+  z-index: 31;
+  content: url('../../logo-unige.png');
+}
+
 .reveal {
   font-family: var(--r-main-font);
   font-size: var(--r-main-font-size);