Fix sidenotes bleeding into text inline

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

assets/scss/sidenotes.scss

@@ -48,7 +48,10 @@
 
 @mixin hidden-sidenote {
     position: static;
-    margin-top: 1rem;
+    // Author can override margin inline to shift sidenote, but when displayed
+    // on mobile (and thus, between text), shifting it would overlap it
+    // with text, so override the shift.
+    margin-top: 1rem !important;
     margin-bottom: 1rem;
     width: 100%;