Remove leftovers of a failed experiment

static/css/isso.css

@@ -74,14 +74,3 @@
     background-repeat:no-repeat;
     background-size:contain !important;
 }
-
-.menu {
-    min-height: 2.8rem; /* no way to control min height in Tachyons */
-    max-height: 0; /* hide menu completely when burger unchecked */
-    transition: max-height 0.5s; /* show/hide menu transition */
-  }
-
-  /* when checkbox is checked, display menu (sibling element) */
-#burger:checked ~ .menu {
-    max-height: 100%;
-  }